Are you saying this is safe? Because these two phones are different software-wise, although they look almost identical. It would be great, but I need to be sure, because of bricking the phone.
I have flashed the beta version of Android 7 and I see that the option is present for Max too. I couldn't see if it actually works, but I will try with my wife's case. It has a window and maybe It will show me something.
my case has a magnet in it, so I think its the magnetometer doing the detecting as the screen also comes up when the magnet is held to the rear of the phone
Of course preloader unchecked as us different model of phone.
I hope that you know that you can join to umi max beta version of Android 7.0.
Here is beta ROM for umi max http://community.umidigi.com/thread-6608-1-1.html