The start system in Coreelec is not compatible with LibreELECE Armbian etc. If you run coreelec on your TV box, you will no longer be able to run LE and Armbian normally until the full recovery of the standard firmware via the USB Burn Tool and the new activation of the universal multi-boot, which is used in all new systems.
Questions that do not specify exact details (the exact image version, TV box model, detailed steps that were performed for DTB settings, and so on) will be ign