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Nope. Custom XMB doesn't matter. I've never been able to update 3.52 M33 - 4 to 3.71 on any PSP. It's got to be from M33 - 3, not 4. Not sure why. Anyways, to answer your other question, you can't put any flash0 files from one PSP onto another, unless they're decrypted.Good news is you can now go from 1.50 straight to the latest fws.