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ZOMBIEKILLAH
Hey! meet me in my office! I have a possible 4.21 CFW/MFW I need great assistance in this matter!
Oh and bring a PUP File viewer or something because I don't know what to do with it other than install which could just end up bricking my PS3!
http://www.ps3hax.net/showthread.php?p=439223#post439223