Continue? įormat: Total sectors in formatted partition: 501728įormat: Total bytes in formatted partition: 256884736įormat: Operation completed successfully.Ģ56487424 bytes total (256487424 bytes free) Continue? įormat operation will destroy all data in “flash0:”. Pre-requesits:ġ) Console access to the Cisco device in questionģ) A TFTP server which the Cisco device can accessįirstly, lets see what happens when you lose your IOS:įormat operation may take a while. 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. 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.
A big thanks to Richard Morrell ( ) for this! Thought I would add this to my blog to help anyone that was in the same situation I had back in April.
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