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On Pi4, there are a known problem with PPSSPP regarding freezes and lag ingame. PSX is optimized and works better. Check your roms.
@danilovertuan please upgrade to 7.0.1 this should fix your issue
No one has replied
https://forum.recalbox.com/topic/8314/unable-to-update-to-unstable-version/9
@ydhainaut please dont up old topic.
https://github.com/recalbox/recalbox-os/wiki/Retroarch-setup-overlays-(EN)
@blackmagik
Create below file and put in your command /recalbox/share/system/custom.sh
Make it executable chmod +x custom.sh
/recalbox/share/system/custom.sh (if exists) is ran at boot.
The files will be in the save directory. Try it and tell us if it works. If it does, open an issue and i will add that for fba_libretro only.