I have done everything like it was said. Tried tw odifferent versions of libreelec latest and the earlier like mentioned in other post. I changed dtb after I created installation with rufus on usb drive.
I tried to shut down and restart mecool tv box and I tried even after that. The box simply doesn't want to start libreelec.
It was bought in december, it is model Mecool M8S PRO W 2.4G Voice Control with Andriod OS Support TV Box - BLACK EU PLUG (2.4G VOICE CONTROL)
I've tried coreelec before and it is the same. I tried to press that small button on the bottom of the box, because it has no reset button like some previous models in AV but appereantly at the bottom of the box where there is tiny hole. Even that didn't help.
Is there any thing I can do? Thank you.