I have a Cisco 7206 Router with Network Processing Engine 200. I want to upgrade its IOS to its latest image. I recently downloaded the IOS 12.4 after I uploaded the IOS the router said that the IOS is not supported on NPE 200. Could you give me some specific advise on what kind of IOS and feature sets should I use for this to work. I want to use it as a Firewall and at the same time for routing purposes. Please advise ASAP.. Thank you in advance.