@hyamanieu yeah, forgot to mention that exiting the game works, but thanks for info.
so, is there another way to alter the n64 settings?
read somewhere, that it is possible to change retroarch menu in game to some xmb, which should work then, but i have no clue...
concerning the shown memory that s mentioned 2 posts above, mayby the rest is used for video ram?
but cannot confirm what is shown in my recalbox, not at home atm.
Hello.
Since I'm new here I first of all have to say, thanks al lot for this wonderful piece of software 
I installed this beta Version on my new rpi3b+ and so far, after reading this whole thread (well, most of it) i got most of my problems sorted out, most importantly, my 8bitdo sf30 pro is working now (had the problem that it did not work in retroarch, like mentioned above, fixed by mapping the l2/r2 buttons again).
Overclocking seems to work too.
So here are my unsolved problems:
The biggest thing is, Retroachievements isn't working. I tried putting in my name/password in menu as well as in recalbox.conf.
It says, when starting a game, that I'm logged in with my username, but then says that this game has no achievements.
I tried it across several different systems (snes, nes, megadrive, etc.), with lots of different roms and romversions, but its the same with all of them. Is there something I'm missing? Or does it not work as of now?
Next thing is, i can choose favorites, they then show up in the main system select screen, but after a restart, they are gone.
I cannot access the emulators menu in n64 and neogeo. I can access it with hotkey+b in snes, megadrive, nes, pcengine, even psp. This seems rather important, since most n64 games i tried so far seem to need some tinkering with the settings.
I don't know if these are related to the betaversion, since I havent used other version before.
Best regards