I tried booting CoreELEC (20.0-Nexus) from SD card (created properly) - I disconnect power cable, inserted SD card with CoreElec, with Reset button pressed connected power cable ... and Adroid booted. Coud anybody help me with this ? Maybe is there some HW malfunction of Reset button ? I have no idea, how to test it.
CoreELEC 20.0-Nexus support GT King II, I tested also Amlogic-ne CoreELEC nightly builds ... tested with 2 different SD cards and one USB disk - device not start booting from SD card or USB disk.