Backups work on one XBOX but not another

[darrenfisher2]

Hi

My brother has backed up some games for me which include Max Payne2 and Medal of Honour Rising Sun. They work perfectly fine on his XBOX however when I run them on my XBOX they appear to start loading with the XBOX screen coming up, but then it flicks back to the menu screen and nothing happens. There is no message that it can't read the disk. It is though the XBOX knows its a back up and stops loading. I have other games which he has backed up for me and they work fine. He has even backed them up onto different media with the same result. They work on his chipped XBOX but not mine. I think my chip is an Xecutor chip, i'm not sure what his is. Is there anyway or technique I can use to get them to work without reburning them? Cheers.