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I can upload firmware 1.50 on my 2.0 ??? with firmware available 1.50 by dark alex???

I own a psp system software 2.0 i want to upgrade it (after research i found that firmware 3.71 m33 will work) cause i want to play games on from my 4gb memory stick can any 1 help with instruction please??? Im completely lost after lot of research on how to do it!!!! Not found a good explanation an...