The new AP2.5 was supposed to have been designed to prevent you from playing a game that has AP2.5 on it if your drive wasn't flashed with LT+v1.0/.1. This won't "brick" your xbox, it will just prevent you from playing those games that have AP2.5. Older games will work fine. As far as I know, if you're banned you can still play offline with no problem. The only issue you will have is that you won't be able to connect to LIVE for friends, achievment tracking, DLC, or updates.