Flashing Guide

Clean Flashing:
1. Boot into your custom recovery(PBRP Recommended)
2. Select Wipe > Advance Wipe
3. Select System, Vendor, Data, Dalvik, Cache
4. Select Install > Flash ROM
5. Reboot to Recovery
6. Select Wipe > Format Data > Type "yes"
7. Reboot to System.

For device certification:

1. Use the attached keybox from the post
2. Settings > Mistify > Component Spoofing > Select keybox XML to spoof > clear playstore data > reboot