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@people playground To reset the resolution on Recalbox 9, access the web manager via your browser, navigate to display settings, and reset to default. Alternatively, connect via SSH and edit the /boot/recalbox.conf file to reset video settings.
@bonna79 @stedurst Do you both use a laptop ? You can try to configure your screen this way : https://wiki.recalbox.com/en/tutorials/video/display-configuration/external-screen-configuration Any information about your hardware may be usefull...