If a router does not have a valiod IOS image and reboots in ROMMON mode, you can upload an IOS image as follows:
IP address of the router.
IP_ADDRESS= ip_address
Subnet mask of the router.
IP_SUBNET_MASK= ip_address
IP address of the default gateway of the router.
DEFAULT_GATEWAY= ip_address
IP address of the TFTP server from which the software will be downloaded.
TFTP_SERVER= ip_address
The name of the file that will be downloaded to the router.
TFTP_FILE= filename
Start the upload by typing
tftpdnld
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