Hello dtech ,
Libreelec is working very good on the MXIII only i have 1 problem and that is that i cannot turn it on when i turn the box off within kodi.
It does go to sleep mode but then i cannot turn it on, not with the remote and also not with the power button.
I have to completely turn off the box by keep holding the power button or to unplug it and then turn it on again and then it works again.
I have also tried another DTB but still the same issue.
I hope you can do something to fix it.
Many thx in advance.