right now you can only do a half byte loader (homebrew)
hey u just cant
Recently you can not make your psp with a custom firmware with out Pandora, Think about buying a Pandora battery on eBay, they are cheap.
It is impossible without the use of a Pandora Battery or Magic Memory stick.
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Right now there isn't. If you want to get custom firmware for psp version 6.20 you need to downgrade to custom firmware using a Pandora battery.
You're in luck! There seems to be a homebrew enabler out for official firmware 5.03. http://www.youtube.com/watch?v=lPMiNTbL7YQ
No, you can't. And even with a Pandora Battery, you cannot downgrade the 3000 or the late 2000 model.
change the Pandora battery and the magic memory stick back to normal.duh.
Get a Pandora battery & magic mem stickITS NOT HARD, ITS SIMPLE
definitely no the best u can downgrade without a Pandora battery is 3.03.... what you can do is use the Pandora battery to downgrade and the results will be great I've done it on my psp and when i downgraded my psp i got to download as many games that can fit into my psp(full games of course) so downgrade your psp using a Pandora battery:)
you can only go from 3.72 official firmware to 3.90 custom by using a Pandora battery to downgrade your psp to 1.5 then upgrade to 3.90. to obtain a Pandora battery you cam buy one from eBay or if you know someone on custom firmware, they can make one. (WARNING, once your psp battery has been turned into a Pandora battery it can't be used as a normal battery)
You need custom firmware or a Pandora battery and a magic memory stick.
There's a chance it will break it, it allows you to downgrade your firmware so you can put on custom firmware, this is ILLEGAL. Also, if you do it wrong it would destroy your psp