Upgrading Cisco 2620 or 2621 Routers to Support 32MB Flash

By Gordon Thompson
Technical Manager

Cisco provides a BootROM upgrade kit that allows you to upgrade Cisco 2620 and Cisco 2621 routers to support 32MB Flash. Below is a step-by-step guide to the upgrade.

Remove the old BootROM from the u22 socket and replace it with the new one provided in the upgrade kit.
Install the 32M Flash SIMM included in the kit.

Because there is no IOS on the router or Flash SIMM, you will need to perform disaster recovery. Either the X-modem or TFTP Download process will work, but the TFTP Download is much faster.

Perform the TFTP download. Power on the router and let it come to ROMmon prompt. Enter the following commands:

rommon1> IP_ADDRESS=192.168.32.50(use your internal address scheme, may be 10.0.0.0 or 192.168.0.0) *hit enter*
rommom2> IP_SUBNET_MASK=255.255.255.0 (the subnet mask must match your addressing scheme) *hit enter*
rommon3> DEFAULT_GATEWAY=192.168.32.254 *hit enter*
rommom4> TFTP_SERVER=192.168.32.24 (this is the address of the tftp server running with the IOS image you will download) *hit enter*
rommon5> TFTP_FILE=(paste the file name in exactly as it is saved to your tftp server, should be a .bin file) *hit enter*
rommon6>tftpdnld *hit enter*

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