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Since the firmware is so so high (above 5.03) a battery is needed for it, your very lucky as many people have 3000s and even a pandoras battery wont work for them. so thing is i have one, i can make them, but i cant just downgrade a psp with 5.51 wtihout battery and also a proper memory card.
so if you would like i could send you they proper utilitys to do so. no charge.
Depending on what you have Sounds like you wanna play iso/cso's wich you need custom firmware for your psp m33 etc. just to play them thers a place to get lists of them just under copyright law you cant just take em you have to say your gonna delete em (but you really dont -_-) i cannot link you any websites because its illegal to do how ever if you google m33 you can find your way arround and nobody is responsable for you breaking your psp if you screw up installing custom firmware.
you can't update your psp from custom firmware(what you have) to official firmware (what your trying to get to) What you need is to upgrade your firmware from OE-A to M33. All you need to search for is 3.51 m33 creator.
I think the best solution is to downgrade your PSP system software to the original version and check if your games load. What might have happened is that the firmware software that was on the PSP was downgraded to play copied games, and now you've changed the firmware to a newer version and that is why your games won't load. You might hac=ve to get your PSP downgraded again to play the games from your memory card.
this is a bug/glitch in the psp system i would advise using pandoras battery and just put it back to 1.5 and try using custom firmware it runs smoother if you are not experienced with the psp get someone who is that has custom firmware to make a pandoras battery and downgrade to 1.5 then just update normally if that dosnt work try sending it to sony but this happens to me too sometimes not that often though ever since i went to custom firmware if you do get pandoras battery and want custom firmware look up Angelmikey all his psp videos are to the point and very deatailed hope this helps