Digging up an old post but the question wasnt really answered and i'm in the same boat. I just bought an xbox for spares and found it has a xenium chip fitted using a socket, i plan to use this in a slimbox conversion but my only real problem with the chip and its bios is that when using the dvd dongle and controller it doesnt work properly and it skips thru the menu without being able to select anything, it only seems to work with a genuine MS S controller and nothing else. I will try and replace the bios first to see if that rectifies the problem but not sure which bios i should use, currently has Evo X and M8 dash.