I did a fresh reinstall and used the "connect via USB and hit the button after 10 seconds" method and now see no issues. Not sure what the issue was before, but this stuff is too advanced for me to solve.

Thanks for all your help!

Thank you, this was exactly the problem. I forgot everything must be on FAT32 to work on the Pi. I used the Disk utility on my Mac to format and now everything works fine.

@rockaddicted

Perfect, that did it! Just needed to change to a different core (went to fceumm).

Thanks!

@rockaddicted Yeah, it could be useful, specially when editing game covers or some annoying stuff 🙂

the ? is pure evilness ... glad it's solved 🙂

I could solve part of my problems with this Wiki here:

https://github.com/recalbox/recalbox-os/wiki/Copy-roms-from-a-Computer-to-the-SD-Card-using-an-USB-Stick-(or-External-Hard-Drive)-(EN)

If someone has the same problem [with a tip about 4.1] 😉

@screech WOW, thnks man, u're very kind, i'll try that

Thnks a lot

it needs an update of the mame2003 core. Will happen at least in 4.1

Great @futhamucka

Glad, we could help. Upvoting helpful comments is appreciated, btw. 🙂
I mark the topic as solved.

Thank you very much. It took some hours to figure it out the "hard" way. First messed a little bit around in Ubuntu just to see that i don't have write permission on the folders. Afterwards installed some programs on my pc until i finally solved it with winscp. Oh god could've been so easy. 🙂

Thanks for the tips ! (sorry for the late reply, I just noticed that I was not watching the thread for some reason?)
Will try this and let you know

it's a buildroot system, so no modified distribution.

Moved to the right section

@Robsdedude This is the best way to report an issue directly on GitHub: https://github.com/recalbox/recalbox-os/issues

There is a way : edit ES code, tweak it, then recompile. I think you should also edit configgen, didn't check

There are some dev basics on the wiki

I wouldn't recommend you use a static ip. Rather set a fixed ip to the mac of your wifi dongle

ya welcome!

@kaihansen1 no, romset 0.2.97.37 for fba_libretro since Recalbox v3.3.0-b15
https://github.com/recalbox/recalbox-os/wiki/Advanced-Arcade-on-Recalbox-(EN)

Have you tried with a different emulator to see if it makes any difference?
This old thread might be helpful: https://forum.recalbox.com/topic/2882/theres-some-way-to-turn-on-fm-sound-on-master-system-emulator-on-recallbox/2