Flashed two Mi5´128GB/4GB from 6.11.10 to 6.12.8 - no problems
Both phones unlocked and rooted.
1. Updated official TWRP to 3.2.0-3, rebooted twice to Recovery to be sure
2. Flash downloaded 6.12.8 package using TWRP, reboot to System
3. Flash SuperSU2.78-SR5 using TWRP, reboot to System
All OK.
One "bug" I noticed, the "Move Apps" button is now replaced with "Themes", so now no way to move app icons to another screen.
Any ideas or alternative ways to move them?
EDIT - never mind, found it, when in the "pinched-in" screen mode, touch and hold the icon you wish to move, then a message at the bottom of screen will tell you to drag it to the bottom, then you can swipe to other screens and move at will.
GM