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Although it is possible, it is extremely risky and expensive. I don't recommend it, but you could try a Pandora batery or Magic Memory Stick Pro Duo.

-Good luck, DarkShadow6

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โˆ™ 2011-09-13 04:48:17
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Q: How can you downgrade 5.02 psp to 1.5?
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Related Questions

How to downgrade a PSP?

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No, Pandora Batteries (the only known way to downgrade PSPs) do not work with the PSP-3000, and, as such, you can not downgrade it.

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It is not yet possible to downgrade a PSP 3000 series.

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Can a Pandora battery downgrade a psp from 5.02 ofw?