The MTCD Radio app is the default software used by these head units to process FM and AM signals. Unlike streaming apps (Spotify/YouTube) which use data, this app relies on a physical hardware connection (antenna) to function.
If you own an aftermarket car stereo based on the platform (common in Eonon, Xtrons, Pumpkin, and Joying units from a few years ago), you might have encountered a frustrating issue: the built-in Radio app stops working. It might open but have no sound, fail to scan stations, or crash immediately. mtcd radio app work