Android - Disable Cyanogen Privacy Guard from Shell
Removing /data/system/appops.xml
from TWRP (recovery) helped.
Instead of removing /data/system/appops.xml
you can also edit it, at least if only the permissions to "Google Play Services" are the problem.
As I didn't want to re-configure all the app permissions, I downloaded appops.xml
through adb (adb pull /data/system/appops.xml
) and removed the section
<pkg n="com.google.android.gms">
…
</pkg>
This just removes all settings for Google Play Services.
After that I uploaded the edited file again (adb push appops.xml /data/system/appops.xml
) and everything works after restart.