Firstly, after I flashed my K5 with a third-party firmware and then reverted to the original factory firmware, the calibration file seems unable to calibrate the battery. The original factory firmware also doesn't have a manual calibration option.
Secondly, does K5's complete repeater tail-end suppression function actually have no effect? Regardless of how many milliseconds are set for suppression, it has no effect. In contrast, my first-generation Xiaomi device can automatically suppress repeater tails without any settings.