User's Manual

CHAPTER3
UpgradingtheFirmware
24
you will work within a Windows HyperTerminal window on your
computer.
Before upgrading the firmware, you must reboot the A753 to access
the bootloader mode’s command line interface. Follow the procedure
described under Booting the A753 to get into the bootloader.
Before you start the upgrade, it is very important that you copy the
firmware image to the hard drive of the computer you use in the field.
You also need to know which version of the bootloader you are
running. You can determine the version any of the following ways:
• Look at the bootloader’s sign-on message when you start it.
• At the bootloader mode’s > prompt, enter the Version command.
• In firmware mode, enter the Reboot <ID> command and look at
the sign-on message.
• In firmware mode, enter ver at the # prompt.
Now you’re ready for the upgrade.
1. At the ’>’ prompt, enter the following command:
upgrade 115200
The upgrade process starts.
Note: For pre-1.7 versions of the bootloader, omit the speed parameter
(115200 used to be the default). For 1.7 and later versions, include
the 115200 baudrate parameter. If you do not specify a baudrate, the
upload runs at the default 19200 baudrate.
Change the baudrate of your terminal to '115200' and
hit <Return> to start flashing.
2. Select
FileProperties to open the hyperterminal’s Properties
dialog.
3. Select a com port for the
Connectusing field.
Note: If your bootloader is version 1.7 or later and you used the > update
command rather than the > update 115200 command, you can skip
Step 4 through Step 6. The bootloader will use a baud rate of 19200.