I've installed images from download page (bother buster linux 4, focal linux 4) and installed them to eMMC with multitool. They boot nicely and are stable.
I did use the libreElec dtb file, then the alternating led flashing red/blue went away and blue stayed on.
Right now after testing some days, I can't boot libreElec from SD or eMMC (which worked ok previously, with erasing flash thru multitool), also adding dtb now leaves me with an unbootable system
I can flash with multitool one of the stable images. If i select RK3228A, RK3228B or RK3229 and reboot, I get a