@acris Thank you for your quick reply, but after entering the command "systemctl disable hciuart" the terminal responds to me as follows: "-sh: systemctl: command not found".
I don't know what I'm doing wrong, but this command does not work 
Best posts made by Voytex86
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RE: How to disable hciuart on Raspberry Pi 3 B+?posted in GamePad/GPIO/USB encoder
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RE: Retroarch settings without startingposted in Recalbox General
I don't think it's possible to open the RetroArch menu without entering the game.
You can try to edit one of these files via LAN with Notepad ++ or via terminal with GNU nano:-
share/system/configs/retroarch/cores/retroarch-core-options.cfg
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share/system/configs/retroarch/retroarchcustom.cfg
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