ok update didn't work
ERROR: LibreELEC-S905.arm-8.2.4.2-S905Test-1529136339.tar is not compatible with S905.arm hardware - update cancelled.
Current system: S905.arm
Update system: S912.arm
........
Update: Same issue with img.gz file
I have Beelink MiniMX III II S905x with 2GB/16GB