3Com 3C13701 Installation Manual page 53

8 Enter debugging environment in case of faults.
9 Enter the Boot ROM operation menu.
Select <9> to enter Boot ROM Download Menu as follows for upgrade, backup, or
recovery:
Boot ROM Download Menu:
1: Download Boot ROM with XModem
2: Download Extended Segment of Boot ROM with XModem
3: Restore Extended Segment of Boot ROM from FLASH
4: Backup Extended Segment of Boot ROM to FLASH
5: Exit to Main Menu
Enter your choice(1-5):
1 Ignore software version check for backward compatibility. The likelihood exists that your
upgrade attempt fails even when you select the correct software version. If the system
prompts "invalid version" in this case, you can select <a> from Main Menu to have the
system skip version check during upgrade. This, however, works only once; the system
checks software version all the same at reboot.
2 Select <b> to exit and reboot the router.
To enter Boot Menu, you must press <Ctrl+B> within three seconds after the information
"Press Ctrl-B to enter Boot Menu..." appears. Otherwise, the system starts
decompressing images. To re-enter the menu after that, you must reboot the router.
Upgrading Software Through XMODEM
When upgrading software through XMODEM, you can directly use the console port
without building up another configuration environment.
Upgrading the Application Image
1 Enter Boot Menu (refer back to the subsection "Boot Menu" in this section), press <1>
to select the XMODEM protocol for downloading the application image. The following
download speeds are available with the router:
Please choose your download speed:
1: 9600 bps
2: 19200 bps
3: 38400 bps
4: 57600 bps
5: 115200 bps
6: Exit and reboot
Enter your choice(1-6):
2 Select an appropriate download speed, <5> for 115200 bps for example. The console
screen displays:
Download speed is 115200 bps. Change the terminal's speed to 115200 bps,
and select XModem protocol. Press ENTER key when ready.
3 Change the baud rate on the console terminal (see Figure 5-4) to the software download
speed, 115200 bps in this example. After that, select [Dial-in/Disconnect] and then
[Dial-in/Dialing] to disconnect and reconnect the terminal. Press <Enter> to start
downloading. The console screen displays:
Please Select Program File
Downloading ... CCCCC
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