Hi
VruxaThank you for sharing your experience on ZenTalk. As
Vruxa said, visiting the Repair Center is a quick way to solve the issue; the device can be directly checked by engineers. However, solving the issue by a firmware rollback can not directly assert the root cause on battery drain of the latest firmware. While the rollback process involves the Factory Reset, a better battery performance will be directly perceived. Besides, most of the battery drain issue after firmware update can be caused by the compatibility between the new system and the third party apps. That is why we always suggest the users to update their apps to the latest version once they update their firmware version.
Hence, I suggest all users to perform "Safe Mode overnight check" and "the Factory Reset" first if you have encountered battery drain issue after firmware update. If the issue remains the same, then we can further discuss case by case.