Ya that's how I got it to install, had to do a factory reset first then it would install but it would still freeze when I plugged in a usb hard drive to watch videos or if I was trying to scroll the app page intermittently.
all else fails go back to android 4.4 and use mygica media center to replace kodi in some cases you have to manually update repos but still works like a charm
I found if you do a fresh factory reinstall ( factory firmware, pinhole, ect) then do the upgrade the 5.1 fw will work fine. does run slower but it is a better than buy a new box in some cases.
MyGica_ATV585_600_5.1_20170612
in Beta Files
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all else fails go back to android 4.4 and use mygica media center to replace kodi in some cases you have to manually update repos but still works like a charm