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IOS update problem

Trying to upgrade 3620 router with IOS v.12

Have tftp'd successfully to flash (and erased original).

Upon reload, gone into romon mode.

At romon 1 - have issued 'confreg 0x2102' (to ensure boot instructions found in start-up config)

At romon 2 - have issued 'reset'

Getting following message: -

loadprog: error - on read during ELF program load

requested 6693080 (0x6620d8) bytes, got 2951668 (0x2d09f4)

boot: cannot load "flash:"

Have I missed anything glaring!

Thanks in advance


Re: IOS update problem

A system enters the rommon mode if it is unable to find a valid image in the flash. Are you sure you loaded the correct image. Anyways, you should see if a valid image exists anywhere on your router. If none exists, you will need to use the xmodem procedure. The Xmodem procedure for the 3600 is available at

The normal IOS upgrade procedure for the 3600 (same as 2500) is available at

You could also refer to 'Software Upgrade Procedure' at

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