3.71m33-3 is the latest firmware which is made by dark alex however in order to install 3.71 you must install 3.52m33-4 first co cant upgrade straight to 3.71m33-3 without using the pandora method and if your using a fat psp(original not slim) you can also install 1.50 kernel update so that all tour homebrew can still be used.
you can get all the updates from here www.dark-alex.org
and official firmwares you will have to google cos they are getting harder to find.
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