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I heard that there are two diffrent models of the Nand chips , and that the K9F1G08U0B is a little bit dangerous to Flash. ?

if you solder your progskeet properly it shouldnt be a problem to downgrade that model ps3, just look for more info on the internet.
good luck

Thanks! but the Problem is that there ar not many videos about the NAND Flashing.
I want to do it all perfect beacause if anything go wrong im f.....

all i know about NAND flashing is that you have to solder ALOT of cables... the latest progskeets are click and go, like e3 flasher might be something for you