Test the upgraded ROMMON with the dev command. You need ROMMON release 12.4(13r)T (description: C2800 ROMMON Upgrade adds boot from usb flash drive capability).Īfter you've downloaded the file onto a USB token, upgrade the router ROMMON with the upgrade rom-monitor file usbflash0:C2800NM_ command (requires router reboot). ![]() To support IOS boot from USB token, you need a newer version of 2800-series ROMMON which you'll get from the ROMMON download page (registered CCO users only). The product documentation states you can't, but as always, reality changes quicker than documentation in Ciscosphere. ![]() As all 2800-series routers have USB slots, I started investigating whether you could boot the IOS image from an USB flash token. A while ago we were faced with a 2800-series router with no software in its CF card.
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