(1) I thought I had a Matrix Chip inside my xbox, however, I just had the DVD Drive replaced and was told that there is no chip (I have since confirmed this myself). (2) Apparently the xbox bios had been flashed (and not chipped). I was kind of surprised that (a) this could be done and (b) I hadn't had any disc backup problems until recently. (3) I have been able to back up older games but I have had problems with NFS_U2 and Halo2. (4) Can anyone explain (a) what was actually done to my xbox and (b) how I can get it back to a vanilla version before I spend more money getting a real chipping? (5) Thanks in advance.