I found that CoreELEC, EmuELEC and Batocera work on Mecool KM1! It's a certified tv box (less NETFLIX). In my opinion it is the ideal tv box, for its cost benefit. :
Mecool KM1 prefix: specifications, connection and firmware
Mecool KM1 Collective S905X3 4GB/64GB Android 9.0 Certificado Google
Mecool KM1 Google Certified 4K Android TV Box Review - XiaomiToday
MECOOL KM1 Amlogic S905X3 Android 10.0 TV Box Certificado Google Smart Android TV 4K H.265 Media Player 4 GB 32 GB con Teclado I8 : Amazon.com.mx: Electrónicos
Mecool KM1 4GB 64GB Android 10.0 TV Box Google Certified 2T2R WiFi Amlogic S905X3 Smart Android tv 4K Media Player Prime Video 4K + with Keyboard i8 : Amazon.ca: Electronics