ive been using a X2 bios's since i first got my xbox..
2 reasons:
i tried flashing with the M6 bios (ages ago), and was unable to.. kept hanging.. so i flashed it with the X2 bios.. 4976.02 or something like that... and that worked fine..
and ever since.. ive used the X2 bios on my xbox, and ive never had a problem.. flashing... reading games... doing all sorts of stuff.... i use avalaunch.. and now i use the 4980.67.. but will change over to 4980.06 when i get my new hard drive!..
X2 all the way!!!
M7 bios... well i aint flamming it.. im sure its good.. but i cant give it my heart, to change to it...