flash a bootloader.img on an S802 running LibreELEC 8 ?

    Hello guys,

    I have a libreelec 8.2.3.1 installed in my MXIII tronsmart S802 box.

    The provided bootloader is wrong, so the box cannot be shutdown and then started again, have to manually take power off.

    I manage to find an firmware file for this box, which work. I extracted from it the bootloader.img.

    I'd like to know how to implement it in my libreelec 8.2.3.1.

    I did the same on another box with older libreelec, it worked with that command:

    dd if=bootloader.img of=/dev/bootloader

    on this one, it doesn't work. It's many hours I'm looking for it so if anybody can give an hint that would be deeply appreciated.

    Thanks in advance