If the router will not boot then you must do this from rommon mode. 
When the router is attempting to boot, issue a break using whichever
keys your terminal software expects.  When you get to a prompt, type
tftpdnld in lowercase.  This will show you a list of variables that need
to be set for a tftp transfer to work properly.  Connect the ethernet
port on the router to your network (or laptop, or whatever has a valid
image), set the necessary variables, and then type tftpdnld again.  

If all variables are set correctly the router will now begin a tftp
transfer.  When it is finished, type "i" or "reset" to reboot the
router.

HTH,
John

>>> "kwock99"  10/19/01 9:57:44 AM >>>
I have upgraded the Router with the other IOS. After I download it to
the
router and it saved the new IOS to the flash successfully.

After I power up the router, I get the error that the router does not
have
enought memory to run IOS. Anyone knows how to erase the new IOS and
tftp
back
the "old" IOS to the router (2621).

Thanks.

Francis




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