My first concern is that I have no idea what that image is.  I searched CCO for that 
image name and couldn't find it, not in the IOS upgrade planner or the Feature 
Navigator.  The only close one I could find was 12.1(2), not 2.5, and it was about 
200k bigger than the file you mention.

Do you have that image running on another router?  If not, try loading a different 
image.  That one spooks me.  <g>

Perhaps something is wrong with flash, so another option is to replace the flash and 
see if that helps.

Another option is to use the -r option for tftpdnld which will load the image directly 
to DRAM instead of to flash.  If that works, then you know your flash is hosed.

I hate to even mention it, but make sure your basic networking setup is correct 
(addresses, masks, cables, etc.)  That goes without saying, but I'll say it anyway.  
:-)

Good luck!

John

> 
> Hi,
> 
> When I tried to upload my IOS image to the my 2600 router it failed. When
> the router rebooted it kicked into Rommon mode with an error message that
> reads "boot: cannot determine first file name on device "flash:"". There is
> a command in rommon > mode called "tftpdnld" which I run once I have set all
> my parameters, this is surposed to fetch the image of my tftp server. I see
> it connect to my TFTP server but after a second or two it times out and I
> dont get the image.
> 
> If anyone knows why the image does not download, pls help.
> 
> Filename = c2600-io3s56i-mz.121-2.5
> File Size = 8,071 KB
> 
> Thanks
> Warrick FitzGerald
> LiveTechnology International Inc.
> 
> 
> 
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