Cisco 3825 router boot ios from usb

[sunriderhk]

HI All

I got a Cisco 3825 Router CF card failure, can I boot IOS from USB? 

Physically I found 2 usb ports but nothing I can see in ROMMON mode, may I know how to boot from USB?

rommon 1 > dev
Devices in device table:
        id  name
    flash:  compact flash
bootflash:  boot flash
    eprom:  eprom
rommon 2 >

Hugo

[Leo Laohoo]

Hi Hugo, 

The only time you can get an ISR G1 (except 870) to boot from USB is when you have upgraded the bootstrap to 12.4(13r)T15.

The command to boot from USB is a hidden command.  From ROMmon the command is "boot usbflash0:IOS_filename.bin".