Flashing in Rommon mode:

rommon 1 > IP_ADDRESS=171.68.171.0
rommon 2 > IP_SUBNET_MASK=255.255.254.0
rommon 3 > DEFAULT_GATEWAY=171.68.170.3
rommon 4 > TFTP_SERVER=171.69.1.129
rommon 5 > TFTP_FILE=c2600-is-mz.113-2.0.3.Q
rommon 6 > sync
rommon 7 > tftpdnld

IP_ADDRESS: 171.68.171.0
IP_SUBNET_MASK: 255.255.254.0
DEFAULT_GATEWAY: 171.68.170.3
TFTP_SERVER: 171.69.1.129
TFTP_FILE: c2600-is-mz.113-2.0.3.Q

Invoke this command for disaster recovery only.
WARNING: all existing data in all partitions on flash will be lost!
Do you wish to continue? y/n: [n]: y

Receiving c2600-is-mz.113-2.0.3.Q from 171.69.1.129 !!!!!!!!!!!!!!!!!!!
File reception completed.
Copying file c2600-is-mz.113-2.0.3.Q to flash.
Erasing flash at 0x607c0000
program flash location 0x60440000

rommon 8 > reload

Set - Shows current settings.
Sync - Writes current settings.