n3oth4nd3r In SSH (With WinSCP or other)
/recalbox/share/system/recalbox.conf
and
/recalbox/share_init/system/recalbox.conf
Line 171, change global.videomode=CEA 1 HDMI
by global.videomode=DMT 16 HDMI
Then run this command PATH=$PATH:/usr/sbin /recalbox/scripts/recalbox-save-overlay.sh
And reboot