How to make clear install CoreELEC 20.3 Amlogic-no on Odroid-N2 while on download page Releases · CoreELEC/CoreELEC · GitHub it is available CoreELEC-Amlogic-ng.arm-20.3-Nexus-Odroid_N2.img.gz to download only.
Its not clear at least to me.
Also I did “in-place” update from 20.2 to 20.3 and there is no issues so why clear install is needed?