UPDATE BECAUSE I GOT THE DEVICE NAME WRONG - so sorry!
Bit of a noob.
Have an old Docooler M9S Pro 16G that runs libreelec.
I’m trying to get CoreELEC running on an sd card/USB stick with the intention of overwriting the emmc when I’ve got the version I want (19.2+) running ok.
CoreELEC 9.2.8 has ‘gxbb_p200_2G_100M.dtb’ which works fine!
CoreELEC 19.2 doesn’t have a 1:1 match and for the life of me I cannot find a dtb that works.
Tried the recommended DTBs from the download page, and all the device trees mentioned in other Docooler M9S Pro posts and many more, same thing happens - M9S logo screen appears, flashes to black for a second then appears again, and loops.
Any clues? It seems strange I don’t have a problem with 9.2.8