How to revert Androidone X510 to Lollipop I am making use of Androidone,
Model:X510
Version: 5.1.1

Recently, my phone received a system update, so I installed the system update, and my device upgraded to Android Marshmallow 6.0.

After this update, I started having problems with most of my apps. These apps have refused to run.
For example, I installed Modern Combat 4, but after the update, the game doesn't display, it just shows a pink screen.

I have tried everything I could, but I am still having this problem, and there is no way I can contact the manufacturer, because the phone is made by Google.

My main question is this—

How do I uninstall this new update of 6.0, and return my device to its former stage, which is 5.1.1?

Thank you.
I'll try to help you, maybe it's not relevant to your answer (but I think it's kinda). So, yesterday I've got a little problem too when try to installing Modern Combat 4 on my lollipop device. I downloaded the Modern Combat 4 from this link
http://apksaurus.com/modern-combat-4-android-apkdata-download.html

Unfortunately, Modern Combat 4 isn't working normally on Lollipop device, yeah the model will become a pinky object like this.


  


And then I'm doing a quick search on Google just want to know how to fix this, and voila. Maybe you can try this youtube.com/watch?v=m7qj16vnutM
To be noted, it's not a promotion, that's not even my YouTube channel nor video, I just want to say that if you want to play this game on your 6.0 device, you can.