I have a 2851 router that lost the compact flash card today. The current rommon version does not support the usbflash, so I have been trying to update the rommon version. on different sites I have read that you use tftpdnld -u to upgrade that, but the -u option does not exist on my version of rommon, only the -r option, which does not work.
I have also tried to use tftpdnld -r to copy the ios image but it keeps timing out in the middle of transfer.
any hints?