Issues with RetroArch on RG476H/GammaOS
Moin!
TL;DR: RetroArch doesn't start games anymore. And if the Menu/Back button doesn't bring up the Quick Menu.
I got myself the mentioned RG476H and love it. After a short hesitation (my game library is RetroPie-compatible) I flashed GammaOS and re-scraped my games in Daijisho and was happy.
I even added Dosbox (Pure) and played Commander Keen and other.
Today I noticed that the Home button didn't open the RetroArch Quick Menu anymore, which was weird. (L3+R3 does the same, but I didn't have to use that before.) I tried stating a GBA game that worked before and it didn't even start up (it showed only the RetroArch logo). I also tried open RetroArch from the Apps section and it gave me a black screen.
I restarted the console (twice) and I could open some Atari game, but the Home button still didn't bring up the Quick Menu.
I tried to rebind the home key in RetroArch, but apparently I have to hold the button for a second for it to work. But that exits RetroArch...
So, with a heavy heart, I deleted the RetroArch system files, restarted the console, tried to start games, remembered I probably have to reinstall the Cores, tried to find the correct ones and now...
I still get stuck on the RA logo when I try to start a game.
Now I feel stuck and frustrated. What went wrong? Did I break anything? How can I fix things (without losing too much progress)?