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Recover Cisco Corrupt IOS Router Image

Recover Cisco Corrupt IOS Router Image

Cisco Router IOS Image Corrupted? Are you facing this issue? If yes, then here is a way you can recover/restore corrupted router ios image.
Assumptions – You have physical access to the Router or you can take console using HyperTerminal remotely.
Solution –

  • Take a console using HyperTerminal and get the router rebooted.
  • When the router is booting up, press CTRL + Pause Break to enter into ROMMON Mode. You may need to keep on pressing CTRL + Pause Break during the reboot on your keyboard to enter into ROMMON Mode.
  • Once you are into ROMMON Mode, you will get a prompt like rommon>
  • Enter information like IP Address, Subnet Mask, Default Gateway, TFTP IP Address,  TFTP File Name in the below format.
  • IP_ADDRESS=X.X.X.X (Replace X.X.X.X with a valid IP Address)
  • IP_SUBNET_MASK=XXX.XXX.XXX.XXX (Replace XXX.XXX.XXX.XXX with a valid Subnet Mask)
  • DEFAULT_GATEWAY=X.X.X.X (Replace X.X.X.X with a valid IP Address)
  • TFTP_SERVER=X.X.X.X (Replace X.X.X.X with a valid IP Address)
  • TFTP_FILE=c1841-advipservicesk9-mz.124-15.T1.bin (Replace FILENAME.BIN with the file you are uploading as an IOS Image)
  • tftpdnld


  • It will prompt you if you want to continue, Press Yes. In sometime, the file will be pushed into router’s flash.

                              program flash location 0x61fb0000
                              program flash location 0x61fc0000
                              program flash location 0x61fd0000
                              program flash location 0x61fe0000
                              program flash location 0x61ff0000
                              program flash location 0x62000000

  • Once the process is completed, you need to type “reset” command to reload the router ios to boot with the new image.


The router should be now loaded with a new IOS image.

Enjoy, Cheers!!

Published by Team UC Collabing

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Subodh Kumar
Claudio Quiroz Cabello

Electrical Engineer CCNA Collaboration CCNA Voice CCNA R&S. I'm Electrical Engineer and I work like Support Engineer for a Telephony Service Provider Company. Before that I had position like Pre-Sale Engineer about small and medium multivendor telephony solutions. I have 5 years of experience working in Telephony Multivendor Projects. I am also 3 years of experience working in Support and implementation about Cisco Collaboration platforms: UCS server, UCM, Cisco Unity, Presence Server, Jabber, Gateway. Support Community is most useful in finding design, implementation and support tricks and shortcuts that greatly help me in my daily activities. If you need to contact me, please you can writte me.

Kanishka Singh

CCNA Routing and Switching
Am a technology enthusiast. I work in network support providing support with implementation, maintaining and precisely troubleshooting the infra.
Realm of collaboration makes me want to learn and face new challenges more and more.