How to revert Androidone X510 to Lollipop
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.