I made a thread about this yesterday, but deleted it because I thought it was fixed. I have coreelec on an emmc and Android TV on an sd card.
With the sd card inserted, the coreelec logo comes up, screen goes black, and then I lose the hdmi, signal. This process repeats endlessly.
I don’t really understand why it is doing this. Any ideas? My goal it is to have dual boot with both emmc and sd card inserted. But this is preventing that.