I have a 4500 switch with a SUP II Plus (WS-X4013+) engine running version 12.2(20)EWA IOS software. Can I upgrade this engine to IOS release 12.2(25)SG and if so do I need to do any other upgrades first?

I am using Cisco 1231 ap's with ACS v3.3 and peap auth, the ACS server is using machine auth. also, and AD user database. Everything is working really well with PC's and even with the Macbooks if the password is typed correctly. The problem occurs wh...