Originally Posted by C0dy
Does anybody know the differences of M33 and GEN firmware?
M33 was developed by Dark_Alex, who completely dropped off the face of the earth some time last year. The problem with M33 is that it only goes up to 5.00 M33-6. Most games requiring 5.50 and above will not work with this CFW as they check for FW version. There are patches to allow you to play those games, like those released by yoshihiro (also part of team GEN)
GEN is not a beta version, but they are always improving it, so it is always an unfinished product (you can thank Sony's efforts in blocking CFW for that). They have grown a lot over the last year or so, and honestly, it is quite stable and fast. Most homebrews run flawlessly on it. I personally have D3 and never looked back