Recover a Faulty IOS Upgrade
Cisco 675

You can tell that you have a faulty IOS on your Cisco 675 when your router boots into ROM monitor mode and not into normal mode. You can tell this when the prompt is set to "=>". This means that you are in ROM monitor mode.

• Get to the "=>" prompt via HyperTerminal. You can get help on getting into HyperTerminal here.
• Once at the "=>" prompt follow the below commands.

  =>df 10008000
  (Now go to the Menu bar and click on Transfer, then Send File ...)
  
  
  
  
  
  

  Now locate your .ima file for the IOS you want to run once your done with your recovery.
  
  

  Once the unit is done transfering the file it will output the file size. WRITE THIS DOWN YOU WILL NEED IT LATER.

  Now continue with the below commands at the "=>" prompt. This will erase your current, corrupt software image from memory.

  =>es 0
  Eraseing sector 00000000
  Sector erased
  =>es 1
  Erasing sector 00000001
  Sector erased
  =>es 2
  Erasing sector 00000002
  Sector erased
  =>es 3
  Erasing sector 00000003
  Sector erased
  =>es 4
  Erasing sector 00000004
  Sector erased

  =>pb 10008000 fee00000 (file size)
  (Where "file size" equals the file size from the transfer that I told you to write down earlier)
  

  (The system will respond with the below after about 10 to 20 seconds:)
  Programming flash address 00000000 from 10008000...
  Flash programmed

  (After you recieve this prompt power cycle the router and it will come up running the new IOS. The power cycle will take some time, so let it do it thing. Now you will have to reconfigure your Ciso 675. Refer here for configurations for the Cisco 675.