S905X 1GB (Android 6) and CoreELEC NG boot failure

[boot2k3]

How to use the Team CoreELEC ceemmc tool

RU Team CoreELEC ceemmc tool [ceemmc] This tool is written by Team CoreELEC and exclusive for Amlogic devices running CoreELEC! This tool ceemmc can be used for a safe installation of CoreELEC to internal eMMC storage. Users have the choice to install CoreELEC on their eMMC in dual or single boot mode. The boot device priority is: SD USB eMMC If the system fails on booting from the internal eMMC then the device can still be booted by inserting an SD card or USB flash drive with Core…

Read the unsupported section
You need to use ceemmc -x