This German-language tutorial walks through installing muOS on an Anbernic RG40XX H, from downloading the files to setting up BIOS, ROMs, emulators, the scraper and the main settings, all aimed at beginners.
The video covers downloading muOS, preparing the SD card, installing the system, the first start, setting up BIOS files, adding ROMs, configuring the scraper, hotkeys and installing themes.
Source