Can i upgrade directly from V8.2.1.0 (Android 5) to V8.5.1.0 (Android 7)?
Yes you can but... it sux.
I upgraded from 8.1.2.0 to 8.5.1.0 and there are good and bad things.
Good:
- Caroussel is working again
- You may change icon grid to have more icons on the (home) screen
Bad:
- I lost TWRP and root
- Bootloader is now locked
- Power drain doubled (using Waze and having Mi4c plugged in charge does charge engough)
- Heating is much higher, specially when plugged on charge in car
- I now have bluetooth issue with my fav app Podcast Addict
- I have issues with MTP and Windows 7/8.1 (by default, it always sets on charging only when yo connect USB cable)
As a result, I am now stuck with 8.5.1.0
and searching how to unlock bootloader without having to go thru that SMS process.
I don't care if I lose waranty (for what it is necessary ...
). I don't mind to wipe the whole thing I wanna go back to 8.1.2 or may be 8.2.1.
NOUGAT is S.A.B.E.N.A.