It makes sense now why they went after the Switch emulators since technically they run the ‘enhanced’ versions of games that they’re charging an extra $10-$20
3DS decapping fundraiser...
I believe hackers should be rewarded for their work. However, past events makes it harder to ensure that the money does actually go to said developer.
Unfortunately I have nothing useful to add. I guess you could remove the battery and leave it for a week, the PSP will restore itself to factory settings when you recharge it.
I would also check if the R button is internally being pressed as it is quite close to the dpad board, and that may be...
Ok this may be stupid, but try switching your PSP on without the memory stick, and see if anything is responding.
I would also try the Square, Triangle, Start, and Select combination without the memory stick, and see if that solves anything.
It's actually not stupid, but rather a very odd issue. Assuming the repair shop is correct about the PSP not having a hardware issue, it would seem to be either the memory stick or flash1 somehow corrupted itself. Can you not access the XMB at all?