Download EmuELEC 4.6 for S905W (Device tree: gxl_p281_1g or gxl_p281_2g ).
EmuELEC 4.6 supports most USB and Bluetooth controllers. emuelec s905w
The S905W is now a legacy chipset. You cannot run the latest EmuELEC (which features improved latency and newer cores like Yabasanshiro for Saturn). However, for the price of a pizza, you get a dedicated retro machine. Download EmuELEC 4