Banana Pi, Beelink, Khadas, Minix and Ugoos Devices can follow this document to migrate CoreELEC to eMMC safely.
Hardkernel, Libre and Radxa Devices have their own eMMC installation procedures.
For these devices, the tool still can be used to clone the existing installation from eMMC to external media (Option Backup).
Migration to eMMC can be forced on Generic Devices by using the command parameter -x
.
Generic Devices: USE AT YOUR OWN RISK