KR20050078347A - Method for upgrading software of user terminal and the user terminal using the method - Google Patents

Abstract

According to the present invention, when a power for starting operation is applied to upgrade software installed in a wireless communication terminal, a boot loader stored in a flash memory is copied to an internal RAM, and stored in the flash memory in the RAM by the boot loader. The boot code data is copied, and the wireless communication terminal is driven by the boot code data to determine whether to combine with the removable storage device, and when combined, the boot code data is stored in the flash memory using the upgrade data for upgrading the software stored in the removable storage device. A method for upgrading a terminal software using an auxiliary storage device for updating data of a stored code block and booting using the updated code block data, and a user terminal using the method. In the event of abnormal termination, the software can be easily upgraded.

Description

Method for upgrading software of a terminal using an auxiliary storage device and a user terminal using the method {Method for upgrading software of user terminal and the user terminal using the method}

The present invention relates to a method for upgrading terminal software using an auxiliary storage device and a user terminal using the method. In particular, the terminal software using an auxiliary storage device capable of operating a normal user terminal even when abnormal termination occurs when upgrading a user terminal software. An upgrade method and a user terminal using the method.

The development of science and technology and the improvement of economic level are accelerating the establishment of a wide range of communication networks and wireless communication terminals. A user may use a voice call, a data transmission / reception service, etc. while using a variety of wireless communication terminals during a fixed location or movement.

The function of the wireless communication terminal is constantly being improved, and the user can conveniently use various functions of the wireless communication terminal. However, in order to improve the function of the wireless communication terminal, there is a case where the software already installed in the terminal needs to be upgraded.

The conventional method of upgrading the software of the terminal to improve the function of the wireless communication terminal is a method of upgrading using a place designated by the terminal operator or manufacturer, a method of upgrading after receiving and storing data to a computer using a wired or wireless communication network. There is a method of upgrading after receiving and storing necessary data in a wireless communication terminal using a wireless communication network.

First, the method of upgrading using a place designated by a terminal operator or a manufacturer has the advantage that the user does not need to intervene in the software upgrade process. However, there is a problem that the user has to visit the designated place in person, and the operator or manufacturer has to invest huge amount of manpower, money and time.

Next, a method of upgrading after receiving and storing data using a wired / wireless communication network, etc., is performed. After downloading data for upgrading the terminal, the computer is connected to a wireless communication terminal, and then a program installed in the computer is used. How to upgrade the software of the wireless communication terminal. Such a method requires a connection between a wireless communication terminal and a computer, and has a problem in that a general user is inconvenient due to a complicated method of using a program installed in the computer.

Finally, a method of upgrading after receiving and storing necessary data in a wireless communication terminal using a wireless communication network incurs a cost in receiving data necessary for upgrading the terminal software, and takes a long time depending on the data reception speed. There was a problem.

In addition, after an abnormal termination (for example, power off, etc.) occurs during the upgrade of the wireless communication terminal, the wireless communication terminal may not be booted normally. In this case, there is a problem that the terminal needs to be repaired at a predetermined place. .

Accordingly, an object of the present invention is to provide a terminal software upgrade method using an auxiliary storage device that can minimize the time and cost for the upgrade of the wireless communication terminal, and a user terminal using the method. .

It is another object of the present invention to provide a terminal software upgrade method using an auxiliary storage device and a user terminal using the method so that the upgrade of the software can be easily completed even when abnormal termination occurs during the upgrade of the wireless communication terminal software. will be.

It is still another object of the present invention to provide a method for upgrading terminal software using a secondary storage device which does not need to be connected to an external operating device such as a computer or connected to a wireless communication network for upgrading the wireless communication terminal software, and a user terminal using the method. will be.

It is still another object of the present invention to provide a user terminal that allows a wireless communication terminal to proactively determine whether an external storage device is coupled and whether there is upgrade data.

In order to achieve the above objects, according to an aspect of the present invention, a method for performing upgrade of software installed in a wireless communication terminal in combination with a removable storage device, wherein the wireless communication terminal is a flash memory, Including internal RAM (RAM) and RAM (RAM), power is applied to start the operation, copying the boot loader stored in the flash memory to the internal RAM, to the internal RAM Copying boot code data stored in the flash memory to the RAM by the copied boot loader, driving by the boot code data, and determining whether to combine with a removable storage device, the removable storage device; When combined, there is upgrade data for software upgrade in the removable storage device. Determining whether to upgrade, if there is upgrade data, updating data of a code block stored in the flash memory, and performing booting using the updated code block data. Provided are a software upgrade method for a wireless communication terminal, and a system, apparatus, and a recording medium for enabling the software upgrade method for the wireless communication terminal are provided.

The copying of the boot code data stored in the flash memory into the RAM may include determining whether a predetermined key button is input, and if there is an input of the key button, copying the boot code data to the RAM. And if there is no input of the key button, copying the boot code data, the data of the code block, and the data of the user data block to the RAM.

The determining of whether there is upgrade data for software upgrade in the removable storage device may include: retrieving the upgrade data from the removable storage device; extracting first version information of the retrieved upgrade data; Extracting second version information of the data of the code block stored in the flash memory; and determining whether to upgrade the software using the upgrade data using the first version information and the second version information. The updating of the data of the code block stored in the flash memory may be performed when it is determined that a software upgrade using the upgrade data is required.

The wireless communication terminal may include at least one of a secure digital (SD) card insertion hole, a USB-B connector, a USB-mini B connector, a USB-mini A / B, and a 24-pin adapter connector for coupling with the removable storage device. It may include an I / O interface unit including a.

According to another aspect of the invention, in the wireless communication terminal to perform the upgrade of the software installed in conjunction with the removable storage device, a power supply for providing power for starting operation, flash memory (Flash memory), internal RAM (Internal RAM) And a storage unit including a RAM, a boot loader stored in the flash memory, to the internal RAM, and stored in the flash memory in the RAM by the boot loader copied to the internal RAM. A data copy unit for copying boot code data, an I / O interface unit coupled to a removable storage device, and when combined with the removable storage device, a determination to determine whether upgrade data for software upgrade exists in the removable storage device If the upgrade data exists, the code stored in the flash memory An update unit for updating data of a block and a terminal driver for driving the wireless communication terminal by the boot code data and booting using the updated code block data A terminal is provided.

The I / O interface unit may include at least one of a secure digital (SD) card insertion port, a USB-B connector, a USB-mini B connector, a USB-mini A / B, and a 24-pin adapter connection unit.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, the same reference numerals will be used for the same means regardless of the reference numerals in order to facilitate the overall understanding.

1 is a diagram schematically illustrating an overall system configuration for performing a terminal software upgrade method using an auxiliary storage device according to an exemplary embodiment of the present invention.

Referring to FIG. 1, an entire system for performing a terminal software upgrade method using an auxiliary storage device includes an upgrade data providing server 110 and an upgrade data providing server 110 that provide upgrade data of a wireless communication terminal 125. A communication device 115 coupled through a communication network and downloading upgrade data, a mobile storage device 120 storing data downloaded by the communication device 115, and a mobile storage device 120 coupled with the mobile storage device 120. It includes a wireless communication terminal 125 for upgrading the installed software by using the upgrade data stored in).

The upgrade data providing server 110 is a web server owned by a terminal manufacturer or a mobile communication service provider and provides a data for upgrading software installed in a wireless communication terminal through a communication network.

The communication device 115 is a device that accesses the upgrade data providing server 110 through a communication network, downloads necessary data among upgrade data provided by the upgrade data providing server 110, and stores the necessary data in the removable storage device 120. Although only a notebook computer is illustrated in FIG. 1, other devices (for example, a personal digital assistant (PDA), etc.) capable of performing the above functions may be equally applied without any limitation.

The mobile storage device 120 is coupled with the communication device 115 to receive and store upgrade data, and the wireless communication terminal 125 performs software upgrade by using the upgrade data stored in combination with the wireless communication terminal 125. It's a storage device that lets you do that. The removable storage device 120 may perform a data storage function. As long as it can be combined with the communication device 115 and the wireless communication terminal 125 directly or via a cable, it can be used without any limitation.

The wireless communication terminal 125 performs a data transmission / reception function, and is a device capable of upgrading software that is already installed by using the upgrade data stored in the mobile storage device 120 in combination with the mobile storage device 120. Although only a mobile communication terminal is illustrated as a wireless communication terminal 125 in FIG. 1, a personal digital assistant (PDA), an MP3 player, and the like may be further included. Also, in FIG. 1, the wireless communication terminal 125 and the mobile storage device 120 are directly coupled, but the wireless communication terminal 125 may be variously coupled to correspond to the shape of the mobile storage device 120. / O interface structure may be provided. First, the wireless communication terminal 125 may include a secure digital (SD) card insertion hole, a USB type B connector female receptacle (USB-B), a USB-mini B, and a USB-mini A / for direct coupling with the removable storage device 120. I / O interface terminals such as B may be provided. Next, the wireless communication terminal 125 and the removable storage device 120 may be combined using a separate I / O connector. For example, a 24-pin adapter may be coupled to an external connection of the wireless communication terminal 125 (that is, a portion connecting a travel charger or a wireless data communication cable), and the 24-pin adapter and the removable storage device 120 may be coupled. Can be. In this case, the 24-pin adapter may include an I / O interface terminal corresponding to the type of the removable storage device 120.

2 is a block diagram illustrating a detailed configuration of a wireless communication terminal for performing a method for upgrading terminal software using an auxiliary storage device according to an exemplary embodiment of the present invention.

FIG. 2 illustrates a case where the wireless communication terminal 125 is a mobile communication terminal, and the configuration may be different when the wireless communication terminal is a personal digital assistant (PDA), an MP3 player, or the like. . In addition, even when the wireless communication terminal 125 is a mobile communication terminal, some of the components shown in FIG. 2 may be omitted, and other components may be added.

Referring to FIG. 2, the wireless communication terminal 125 may include a handset 210, a voice processor 215, a wireless transceiver 220, an antenna 225, a power supply 230, a storage 235, The display unit 240 includes a key input unit 245, an LED driver 250, an I / O interface unit 255, an upgrade data processor 260, and a controller 265.

The handset 210 includes a microphone for inputting the voice of the user of the wireless communication terminal 125 and a speaker for outputting the voice of another user received from a mobile communication service system (not shown) through the antenna unit 225. do.

The voice processor 215 processes the voice signal received through the wireless transceiver 220 to be output through the handset 210, and also processes the voice signal input through the handset 210 to transmit and receive the wireless signal. Forward to 220.

The wireless transceiver 220 is coupled to the antenna unit 225 to receive a radio signal (eg, voice data, content data, etc.) from the mobile communication service system and output through the handset 210 or the display 240 Alternatively, the voice signal input through the handset 210 is transmitted to the mobile communication service system through the antenna unit 225.

The antenna unit 225 transmits a transmission signal (for example, voice data, content selection data, picture data, etc.) received from the wireless transmission / reception unit 220 to a mobile communication service system, and transmits a wireless signal from the mobile communication service system. Receives and transmits to the wireless transceiver 220.

The power supply unit 230 supplies a power to enable the operation of the wireless communication terminal 125. The power supply 230 may be, for example, a connection terminal for connecting to a battery, a solar cell, or the like.

The storage unit 235 may include operating software of the wireless communication terminal 125, code information for upgrading software, user personal information (for example, a phone book, an address book, a short message, etc.), and the wireless communication terminal 125 may communicate. It performs a function of storing communication related information (eg, a terminal serial number (ESN), a telephone number, etc.) for performing a service. Of course, the storage unit 235 may be divided into a plurality of storage units according to types, uses, and the like of each stored data.

The display unit 240 performs a function of displaying an operation state, a software upgrade state, etc. according to the input of the key input unit 245. The display unit 240 may be, for example, a liquid crystal display.

The key input unit 245 includes a plurality of key buttons to receive a signal for operating the wireless communication terminal 125 from a user.

The LED driver 250 performs a function of blinking an LED (not shown) under the control of the controller 265 so that the user can make a telephone call when a call is received at the wireless communication terminal 125.

The I / O interface unit 255 performs a connection function for coupling the wireless communication terminal 125 and the mobile storage device 120. The structure of the I / O interface unit 255 may be variously configured as described above.

The upgrade data processor 260 determines whether the mobile storage device 120 is coupled with the wireless communication terminal 125 through the I / O interface unit 255 under the control of the control unit 265, and the mobile storage device 120. Determining whether the upgrade of the operating software is necessary using the upgrade data stored in the), the function to perform the upgrade if the software updater is required, the function of determining whether the operation of the conventional wireless communication terminal 125 is the normal end or abnormal end Do this.

The control unit 265 uses the software upgrade data stored in the removable storage device 120 coupled through the I / O interface unit 255 so that the software upgrade can be performed by the handset unit 210, the voice processing unit 215, and the wireless unit. Transmitter / receiver 220, antenna 225, power supply 230, storage 235, display 240, key input 245, LED driver 250, I / O interface 255, and Performs a function of controlling the upgrade data processor 260.

3 is a flowchart illustrating a terminal software upgrade method using an auxiliary storage device according to an exemplary embodiment of the present invention, and FIG. 4 is a diagram illustrating a data structure for upgrading terminal software according to an exemplary embodiment of the present invention. 5 is a diagram illustrating a structure of boot code data according to an embodiment of the present invention.

Referring to FIG. 3, in step 310, the wireless communication terminal 125 starts an operation by a user's key manipulation. When operation is initiated by input of power, the wireless communication terminal 125 copies the boot loader data from the data stored in the flash memory to the internal RAM (step 215). 4 illustrates a data structure for upgrading terminal software. The storage unit 235 of the wireless communication terminal 125 may include a flash memory, an internal ram, an SD RAM, and the like. The internal RAM can be, for example, the storage space that the CPU contains. Of course, the wireless communication terminal 125 may be provided with various storage elements such as SD RAM, D-RAM, DDR RAM, etc. Here, it will be described on the assumption that it is an SD RAM for convenience of description. Flash memory includes specific data in each block (e.g., boot loader, boot code, code data, user data, etc.). It may be composed of a plurality of layers (Layer) for storing the. In step 315 of FIG. 3, the wireless communication terminal 125 stores the boot loader stored in block 0 of the flash memory in internal RAM. In this case, address information (for example, 0XFXXXXXXX) of the internal RAM may be used.

Referring back to FIG. 3, in step 320, the wireless communication terminal 125 determines whether the current booting process of the wireless communication terminal 125 is a normal booting process or an abnormal booting process. That is, it is determined whether the termination process of the conventional wireless communication terminal 125 is caused by normal termination or abnormal termination (for example, power off or error code generation). In this case, whether or not the normal booting may be determined by the wireless communication terminal 125 may be determined according to whether the user inputs a predetermined key (for example, continuous input of the numeric key 5) by the user.

If the previous termination of the wireless communication terminal 125 was a normal termination, the wireless communication terminal 125 uses all the relevant data necessary for booting using the boot loader copied to the internal RAM in step 325. (I.e., boot code, code data in a code block and user data in a user data block) are copied to the SDRAM. At this time, the address information of the SD RAM (for example, 0XOOOOOOOO) may be used. However, the code data and the user data may be limited to the minimum data corresponding to the currently executed application.

However, if the termination of the previous radio communication terminal 125 was an abnormal termination (for example, when the radio communication terminal 125 recognizes itself as abnormal termination or a specific key is continuously input by the user), the radio communication is performed. The terminal 125 copies only the boot code from the data stored in the flash memory to the SD RAM using the boot loader copied to the internal RAM in step 335. At this time, the reason for storing only the boot code in the SDRAM (SDRAM), for example, during the software upgrade of the wireless communication terminal 125, the wireless communication terminal 125 due to abnormal termination of the wireless communication terminal 125 or error code generation If () is abnormally terminated because an error code may exist in the code data stored in the code block, and if an error code exists, the normal operation (eg, normal booting) of the wireless communication terminal 125 may not be performed. to be.

Thereafter, in step 335, the wireless communication terminal 125 operates the terminal by using boot code data stored in the SD RAM. The structure of the boot code data is illustrated in FIG. Referring to FIG. 5, the boot code data may include a kernel layer, a boot device driver layer, and an updater application layer. The kernel layer is a layer that contains kernel information that the operating system must have, and the boot device driver layer is a minimum device driver (eg, at boot time) required for booting the wireless communication terminal 125 for software upgrade. This layer contains the minimum device driver required for the CPU and the device driver for the support of the removable storage device 120. The upgrade application reads the code information (for example, data in the flash memory) to perform a software upgrade. A code for reading, a code for writing data to a flash memory, a code for determining whether the memory is coupled to the removable storage device 120, and version information of upgrade data stored in the removable storage device 120. Code to read, code to determine if you need to upgrade, etc.) The layer to include.

Referring back to FIG. 3, in step 340, the wireless communication terminal 125 determines whether the mobile storage device 120 is coupled. If it is combined with the removable storage device 120, the flow proceeds to step 345 to determine whether there is a predetermined data among the data stored in the removable storage device 120 for upgrading the operating software of the wireless communication terminal 125. . If predetermined data exists for the software upgrade, the flow proceeds to step 350 to perform a software upgrade. The software upgrade process performed through steps 340 to 350 will be described in detail later with reference to FIGS. 6 to 7.

However, if the wireless communication terminal 125 and the removable storage device 120 are not coupled or there is no upgrade data in the combined removable storage device 120, the software upgrade step ends.

FIG. 6 is a flowchart illustrating a method for upgrading terminal software using an auxiliary storage device according to an exemplary embodiment of the present invention in detail. FIG. 7 is a diagram illustrating a structure of upgrade data according to an exemplary embodiment of the present invention.

Referring to FIG. 6, the wireless communication terminal 125 in a state coupled with the removable storage device 120 is a code block stored in a flash memory by a boot cord copied to an SDRAM. The version information of the code data in the code block is read (step 510).

The wireless communication terminal 125 retrieves the upgrade data stored in the removable storage device 120 by the boot cord copied to the SDRAM in step 515, and proceeds to step 520 to retrieve the version of the upgrade data retrieved. Read the information. 7 illustrates the structure of upgrade data. Referring to FIG. 7, the structure of the upgrade data includes a time information area, a version information area, and a data and / or code information area. Therefore, even if the wireless communication terminal 125 only inspects a certain area of the upgrade data, it is possible to easily determine whether to apply the upgrade data. Of course, in addition to the comparison of the version information, it is possible to determine whether to upgrade using the creation time information of the data.

In operation 525, the wireless communication terminal 125 determines whether to upgrade an operating program of the wireless communication terminal 125 using upgrade data stored in the mobile storage device 120 using the read version information.

If it is determined that an upgrade is necessary, the wireless communication terminal 125 updates the code data of the corresponding code block in the flash memory using the upgrade data in the mobile storage device 120 in step 530. However, if it is determined that no upgrade is required, the process proceeds immediately to step 535.

In operation 535, the wireless communication terminal 125 determines whether other upgrade data exists in the removable storage device 120. If there is other upgrade data, the process proceeds to step 520 again. If there is no other upgrade data, the process proceeds to step 540 to boot the terminal. At this time, if the code block in the flash memory is updated, it is obvious that the terminal is booted according to the updated data.

As described above, the area to be upgraded using the upgrade data stored in the mobile storage device 120 is limited to system data stored in the code block. Of course, the wireless communication terminal 125 also temporarily stores the data stored in the user data block in an empty space of the mobile storage device 120, and then again after the upgrade of the wireless communication terminal 125 is completed, the mobile storage device 120 again. By applying a method of reading from and recovering the data), the risk of accidental loss of user data may be eliminated during the terminal upgrade process. In this case, the wireless communication terminal 125 inserts header information indicating that the data stored in the mobile storage device 120 is user data, and selectively extracts only data including the corresponding header information after the upgrade is completed and the wireless communication terminal ( It is obvious that the flash memory can be recovered to the flash memory.

As described above, the terminal software upgrade method using the auxiliary storage device according to the present invention and the user terminal using the method can minimize the time and cost for upgrading the wireless communication terminal.

In addition, the present invention allows the upgrade of the software to be easily completed even when abnormal termination occurs during the upgrade of the wireless communication terminal software.

In addition, the present invention does not need to be coupled to an external operating device such as a computer or connected to a wireless communication network for upgrading the wireless communication terminal software.

In addition, the present invention allows the wireless communication terminal to determine whether the external storage device is coupled and whether there is upgrade data.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art to which the present invention pertains without departing from the spirit and scope of the present invention as set forth in the claims below It will be appreciated that modifications and variations can be made.

1 is a diagram schematically showing the overall system configuration for performing a terminal software upgrade method using an auxiliary storage device according to an embodiment of the present invention.

2 is a block diagram showing a detailed configuration of a wireless communication terminal for performing a terminal software upgrade method using an auxiliary storage device according to an embodiment of the present invention.

3 is a flowchart illustrating a terminal software upgrade method using an auxiliary storage device according to an exemplary embodiment of the present invention.

4 illustrates a data structure for upgrading terminal software according to an embodiment of the present invention.

5 is a diagram showing the structure of boot code data according to an embodiment of the present invention.

6 is a flowchart illustrating a method of upgrading a terminal software using an auxiliary storage device according to an exemplary embodiment of the present invention in detail.

7 is a diagram showing the structure of upgrade data according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

110: upgrade data providing server

115: communication device

120: removable storage device

125: wireless communication terminal

210: handset

215: voice processing unit

220: wireless transceiver

225: antenna unit

230: power supply

235 storage

240: display unit

245: key input unit

250: LED drive unit

255 I / O interface unit

260: upgrade data processing unit

265 control unit

Claims (7)

A method of performing upgrade of software installed in a wireless communication terminal in combination with a removable storage device, wherein the wireless communication terminal includes a flash memory, an internal RAM, and a RAM. , Applying power for starting operation; Copying a boot loader stored in the flash memory to the internal RAM; Copying boot code data stored in the flash memory to the RAM by the boot loader copied to the internal RAM; Driven by the boot code data; Determining whether to combine with the removable storage device; When coupled with the removable storage device, determining whether upgrade data for software upgrade exists in the removable storage device; Updating data of a code block stored in the flash memory when upgrade data exists; And Booting using the updated code block data Software upgrade method of a wireless communication terminal comprising a. The method of claim 1, Copying the boot code data stored in the flash memory to the RAM, Determining whether a predetermined key button is input; Copying the boot code data to the RAM when the key button is input; And If there is no input of the key button, copying the boot code data, the data of the code block, and the data of the user data block to the RAM. Software upgrade method of a wireless communication terminal comprising a. The method of claim 1, Determining whether there is upgrade data for software upgrade in the removable storage device, Retrieving the upgrade data from the removable storage device; Extracting first version information of the retrieved upgrade data; Extracting second version information of data of the code block stored in the flash memory; And Determining whether to upgrade the software using the upgrade data by using the first version information and the second version information. Including but not limited to: The updating of the data of the code block stored in the flash memory is performed when it is determined that a software upgrade using the upgrade data is necessary. Software upgrade method of a wireless communication terminal, characterized in that. The method of claim 1, The wireless communication terminal includes at least one of a secure digital (SD) card insertion hole, a USB-B connector, a USB-mini B connector, a USB-mini A / B, and a 24-pin adapter connection for coupling with the removable storage device. With I / O interface Software upgrade method of a wireless communication terminal, characterized in that. A wireless communication terminal for performing upgrade of software installed in combination with a removable storage device A power supply for supplying power for starting operation; A storage unit including a flash memory, an internal RAM, and a RAM; A data copying unit copying a boot loader stored in the flash memory to the internal RAM and copying boot code data stored in the flash memory to the RAM by the boot loader copied to the internal RAM; An I / O interface unit coupled with the removable storage device; A determination unit determining whether upgrade data for software upgrade exists in the removable storage device when combined with the removable storage device; An update unit for updating data of a code block stored in the flash memory when upgrade data exists; And A terminal driver for driving the wireless communication terminal by the boot code data and booting using the updated code block data. Wireless communication terminal comprising a. The method of claim 5, The I / O interface unit includes at least one of a secure digital (SD) card insertion port, a USB-B connector, a USB-mini B connector, a USB-mini A / B, and a 24-pin adapter connection unit. Wireless communication terminal, characterized in that. In a recording medium tangibly embodied in a program that can be executed in a wireless communication terminal to perform a software upgrade method of the wireless communication terminal, wherein the wireless communication terminal can be read. Coupled with a removable storage device to upgrade software installed in the wireless communication terminal, the wireless communication terminal including a flash memory, an internal RAM, and a RAM; Applying power for starting operation; Copying a boot loader stored in the flash memory to the internal RAM; Copying boot code data stored in the flash memory to the RAM by the boot loader copied to the internal RAM; Driven by the boot code data; Determining whether to combine with the removable storage device; When coupled with the removable storage device, determining whether upgrade data for software upgrade exists in the removable storage device; Updating data of a code block stored in the flash memory when upgrade data exists; And Booting using the updated code block data Recording medium that records a program that executes.