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Below are custom firwares for the Sony PSP. They were developed by DarkAlex and the M33 team. You can go visit their website here


Version 3.52 M33
Update: [1] [2] [3] [4]

Version 3.60 M33(For Slim PSPs)
Update: [1]

Version 3.71 M33
Update: [1] [2]

Version 3.80 M33
Update: [1] [2] [3] [4] [5]

Version 3.90 M33
Update: [1] [2] [3]

Version 4.01 M33
Update: [1] [2]

Version 5.00 M33
Update: [1] [2] [3]