Welcome to our discussion within the PSP Help sub section of the forums, which is part of the Sony Playstation Portable category of this website.
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how did you update your psp?
Jushiro Ukitake of Squad 13 
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By network...its now version 6.00
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you have official firmware now, if you want to play isos and csos you need to go at the most to 5.50, preferrably gen-b2 so you need to downgrade to play anything other than umds.
Jushiro Ukitake of Squad 13 
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i dont have umd.....
sranje....
thanks i will try to downgrade....
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no problem I try to help when I can
Jushiro Ukitake of Squad 13 
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you need a pandora battery and a magic memory stick to downgrade your psp
Jushiro Ukitake of Squad 13 
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ok...i dont have thet...so i will need to pay to downgrade psp
by by 30euro
thanks again...