Their firmwares are nearly identical to the official ones, only better.
of this guide, about how to downgrade your PSP and then upgrade to a custom firmware.
It even allows you to unbrick PSP’s (people call a PSP bricked when it stops working due to software abnormalities). Simple, the Pandora Battery method requires either the use of a PSP with custom firmware, or a spare battery pack.
So if you haven’t got one of those, but you’ve got firmware 3.50 or below, use part one.
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But the community (read: hackers) did not accept defeat.
Leaks were exploited and one after the other, the firmwares fell.
Up to today, neither of the groups have given up, but it is obvious who is winning.
Instead of enabling people to run homebrew, the PSP hacking groups have started building their own PSP custom firmwares.