I found the command line cited in GitHub <span style="font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; line-height: 25.6px;">Just </span>edit the config.txt file<span style="font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; line-height: 25.6px;">, and comment the line</span><br style="box-sizing: border-box; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; line-height: 25.6px;" /><code style="box-sizing: border-box; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 13.6px; padding: 0.2em 0px; margin: 0px; border-radius: 3px; background-color: rgba(0, 0, 0, 0.0392157);">hdmi_drive=2<br style="box-sizing: border-box; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; line-height: 25.6px;" /><span style="font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; line-height: 25.6px;">with a # :</span><br style="box-sizing: border-box; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; line-height: 25.6px;" /><code style="box-sizing: border-box; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 13.6px; padding: 0.2em 0px; margin: 0px; border-radius: 3px; background-color: rgba(0, 0, 0, 0.0392157);">#hdmi_drive=2 # ------------ H - HERE IT IS - GLOBAL EMULATOR CONFIGURATION ------------ # ## The global value will be used for all emulators, exept if the value ## is redifined in the emulator ## Set game resolution for emulators ## select your mode from the command : tvservice -m [MODE] ## CEA 5 HDMI : 1920x1080 @ 60Hz 16:9, clock:74MHz interlaced ## CEA 4 HDMI : 1280x720 @ 60Hz 16:9, clock:74MHz progressive ## use 'default' for using the default resolution ## (string) global.videomode=CEA 5 HDMI ## Shader set ## Automatically select shaders for all systems ## (none, retro, scanlines) global.shaderset=none ## Set gpslp shader for all emulators (prefer shadersets above). Absolute path (string) global.shaders= ## Set ratio for all emulators (auto,4/3,16/9,16/10,custom) global.ratio=4/3 ## Set smooth for all emulators (0,1) global.smooth=1 ## Set rewind for all emulators (0,1) global.rewind=0 ## Set retroarch input driver (auto, udev, sdl2) ## If you don't have issues with your controllers, let auto global.inputdriver=auto ## If you do not want recalboxOS to generate the configuration for all emulators (string) ;global.configfile=/path/to/my/configfile.cfg