Hi!
Thanks for replying.
I didn't install coreelec actually.
I booted from usb flashdrive just for curiosity and it worked. This device was shelved because It was boot looping into android recovery menu and I hadn't the time back then to reinstall stock firmware.
A few days ago I decided to try armbian again when I saw a post about coreelec working with this mecool model.
And, for my surprise, after i booted into coreelec, it booted into Android TV 10, the stock firmware again. Go figure....
So, the device is working with stock android again and now I'm trying to boot armbian to repurpose this old tvbox as a tiny server for light applications...