So I got the Oreo update on my MiBox - and there were a few bugs here and there so i decided to try a factory reset and start afresh. The only problem now is that on the start-up sign-in process, after the final step ('Help Improve Android Performance' dialog) the screen goes blank, and stays stuck like this. The only thing I can do is press back, which lets me start the sign-in process again, leading to the same result. Any ideas?