I origonaly put a modbo 520 in my v5/6 and a MI in my v12. Then the laser broke in the v12 (not repairable) so i put swaped the chips and just use the modbo to dev 1 boot HDL on the v12. Now the v5/6 has the MI but sometimes about 30% of the time the ps2 hangs at the Matrix boot screen. But the modbo never had a problem.