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It's not possible without those two. A kernel exploit must be found for 6.37 or higher to continue. A Pandora battery and a Magic memory stick can downgrade any PSP-1000 and most PSP-2000's. The Pre-IPL (Initial Program Loader) when a Pandora battery is in use is redirected to the memory stick.

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13y ago
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Q: How do you downgrade psp 6.37FW to 6.31 without Pandora and magic memory stick?
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