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How to upgrade the system Flash in the Cisco 2600 series routers

Core Issue

The Cisco 2600 series routers have a single Flash SIMM that contains the Cisco IOS  Software. The Flash upgrade SIMMs are delivered blank, without any Cisco IOS Software. After the upgrade, the router is in ROM Monitor (ROMmon) mode, and requires software recovery.

Resolution

To resolve this issue, perform these steps:

  1. Copy the existing Cisco IOS Software to a TFTP server.      

    For instructions, refer to the Copying Files section of Using the Flash File System.

           
  2. Follow the instructions found in the Replacing the Internal Flash Memory SIMM section of Upgrading System Memory, Internal Flash, and Boot ROM in Cisco 2600 Series Routers.

   3. Load a Cisco IOS Software image into the new Flash through the xmodem procedure.      

     Refer to the Xmodem Procedure for Downloading a Cisco IOS Software Image onto a Cisco 2620 Router section of Xmodem Console Download Procedure Using ROMmon.

     You can also issue the tftpdnld command for this process. 

     Refer to How to Download a Software Image to a Cisco 2600 via TFTP Using the tftpdnld ROMMON Command.

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