No Idea anymore (Can't boot libreelec on one s905 box in any way)

    I've installed numerous s905 and s905x boxes with LE, but I have one box that just flat out refuses to boot LE.
    It's an acemax s905 MXQ pro 4k, and i've tried to flash every known firmware on it, but if it reacts to the toothpick booth (depending on firmware) it just stays stuck on the amlogic logo. (boot from SD or USB).
    (I've fixed a few odd boxes by flashing a new firmware on it)

    (tried with various dtb.img files as well, either 200 or 201, though it is a 201 1G 100Mbit)
    Funny thing is that it does boot almost every Android firmware and even flashing an OpenElec zip works, just not LE.
    (also upgrading from OE with a tar gets it stuck on the boot logo again)

    Does any of you have an idea where to look at to even debug where the problem might be?
    I guess I should just sell it on as generic Android box (or just trash it), but I would love to find out what the *&^#% the issue is.

    if, unlike myself, you are a handyman, you may want to solder a console and perhaps have to watch something there.