Hi,
I'm struggling to make "adb root" work without success... I know this was working in MIUI 7, but with 8 no way. My device is Xiaomi Redmi Note 2, 7.4.13.
So what I do:
# adb kill-server
# adb root
# adb shell
shell@hermes:/ $ id
id
uid=2000(shell) gid=2000(shell)...