>Buy 16 TB HDD
>Buy PS2 FAT
>Buy Official Sony HDD+Network adapter
>Download every single game in every single language
>Download every emulator supported by FreeMCBoot
>Download every single romset for said emulators
>Download full PS1 game sets
>Put the console back in closet
>Never turn it...
I'll take a guess and think that the Home menu got corrupted, so I'd try to replace that. You're in Godmode9 so you can hardly screw up. I tried looking up your problem and didn't find anything either.
Seems like It's not your easy sit-in-the-afternoon project sadly, but @FAST6191 did cover this GBA article which could help you out.
https://gbatemp.net/threads/gbatemp-rom-hacking-documentation-project-new-2016-edition-out.73394/
We had a lot of cases regarding emulation and legality. I can also use Yuzu (among any other emulator) to play my legally owned games at higher framerates or higher resolution.