Suggested prerequisite reading:
»Cisco Forum FAQ »Deleted/Corrupted/Wrong Type/No IOS image and router won't boot

Have you tried to upgrade an image but were unsuccessful? The router is stuck in rommon mode? If yes to any one of those questions; it means that the router cannot find a valid image in the flash memory. The image usually gets corrupted or lost.

Try the following link to recover the problem. The URL should work on any router that has tftpdnld command in the rommon.

Routers ROM Monitor IOS Image Download Procedures

The whole idea is to utilize tftpdnld ROMMON mode command to download working IOS image from your TFTP server to the router. To recover a router using this method, there are assumptions as follow

* You have a valid working IOS image
* You have a working TFTP server
* The working IOS image is stored in the TFTP server

When you don't have TFTP server yet, check out the following FAQ for preparing the server
»Cisco Forum FAQ »How to prepare TFTP server

If you don't have a working IOS image file around, then you should be able to download one from Cisco website; assuming you have Smartnet contract. Check out the following FAQ for more info on Smartnet
»Cisco Forum FAQ »How/where do I get Cisco images (such as IOS, PIX/ASA OS)?

As an illustration on utilizing the tftpdnld command, check out this thread.

»[HELP] ROMmon corrupted

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by aryoba
last modified: 2009-05-19 10:24:55