upgrade IOS via rommon

 Connect your PC to the back of the Router, in this case im using a 1801 – FE0, assigning it a static ip (10.10.1.10)

rommon 1 > IP_ADDRESS=10.10.1.1
rommon 2 > IP_SUBNET_MASK=255.255.255.0
rommon 3 > DEFAULT_GATEWAY=10.10.1.2
rommon 4> TFTP_SERVER=10.10.1.10
rommon 5 > TFTP_FILE=c180x-broadband-mz.124-4.XC4.bin

Download the IOS with the configuration provided

rommon 6 > tftpdnld

          IP_ADDRESS: 10.10.1.1
          IP_SUBNET_MASK: 255.255.255.0
          DEFAULT_GATEWAY: 10.10.1.2
          TFTP_SERVER: 10.10.1.10
          TFTP_FILE: c180x-broadband-mz.124-4.XC4.bin
          TFTP_MACADDR: 00:1f:6c:c5:e5:fc
          TFTP_VERBOSE: Progress
          TFTP_RETRY_COUNT: 18
          TFTP_TIMEOUT: 7200
           TFTP_CHECKSUM: Yes
             FE_PORT: 0 
             FE_SPEED_MODE: Auto Detect

Confirm

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 c180x-broadband-mz.124-4.XC4.bin from 10.10.1.10 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

File reception completed.
Validating checksum.
Copying file c180x-broadband-mz.124-4.XC4.bin to flash.
program load complete, entry point: 0x80012000, size: 0xc0c0

Initializing ATA monitor library…….

Format: Drive communication & 1st Sector Write OK…
Writing Monlib sectors.
…………………………………………………………………………………………
Monlib write complete

Format: All system sectors written. OK…
Format: Operation completed successfully.

Format of flash: complete
program load complete, entry point: 0x80012000, size: 0xc0c0

Initializing ATA monitor library…….

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