It is compatible with Cisco network router 2610XM, 2611XM, 2620XM, 2621XM, 2650XM, 2651XM. All 2600XM routers can be upgraded to support a maximum of 48MB of Flash memory and 256MB SDRAM when using both the Cisco 2600XM BootROM version 12.2(8r) (this item) and Cisco IOS Release 12.1.3T, 12.2, 12.2T, or later Cisco IOS versions.