I am in the process of adding the g radio upgrade kit, AIR-MP21G-A-K9 to an older Aironet 1200 b radio. I follow the steps and then boot the access point. Everything comes up fine, but when I perform a 'show version', it still shows the model number as AIR-AP1230B-A-K9 and not AIR-AP1231G-A-K9. Why is this? Please hep!