Lakka 2.1 doesn't boot on M8S (S812)

I tried already a few S812 images on my M8S but they all get stuck on the boot screen (the flower). I think the latest release I tried was 2.1RC2 (M8), and this one booted OK. I have to say that LibreElec boots fine on the M8S although it is the one from Balbes150, but I had never problems with the ones from Demetris also. Regarding me it is a kernel problem because when I combine Balbes150 libreelec kernel image with the lakka system image, it starts to expand?