Thought I would add this to my blog to help anyone that was in the same situation I had back in April.  A big thanks to Richard Morrell ( @richardmorrell ) for this!

If you have a Cisco router which is unable to boot it’s IOS (flash image is corrupted, lost or wrong build), then you can boot the rommon and ask it to TFTP a replacement image across.  It is preferable you have a working flash device in the router to save the flash image to, but you can just boot it straight from TFTP to memory if you’re desparate.  Pre-requesits: Continue reading →