What did you do about using a Device tree ?
Your Box is what ? MiniMx 1gb / 8gb ?
You must have missed a step along the way as the MiniMx should run on LE.
This is the exact device I have, 1GB version: ** URL removed **
Yes, I downloaded gxbb_p200_2G_beelink_minimxIII.dtb and renamed to dtb.img and placed it in root after writing LibreELEC-S905.aarch64-7.0.2.007.img.gz to the SD card using Rufus.
Anyway, as mentioned, now I'm unable to enter the boot menu in any way, just stuck on the Welcome screen.
But if I get able to enter the boot menu, is it not possible to just copy LibreELEC-S905.aarch64-7.0.2.007-update.zip to a USB and use the boot menu to write it? In that case, what about dtb.img?