Load Cisco IOS on router from ROMMON

rommon 50 > IP_ADDRESS=192.168.2.20

rommon 51 >IP_SUBNET_MASK=255.255.255.0

rommon 52 >DEFAULT_GATEWAY=192.168.2.1

rommon 53 > TFTP_SERVER=192.168.2.7

rommon 54> TFTP_FILE=/private/tftpboot/"filename.bin"

rommon 55 >tftpdnld

Once Done issue reset command

rommon 56 > reset