1. Fixed occasional battery power display error problem.
2. Fixed the abnormal sliding answer and hang up problem.
3. Optimized the stability of phone call.
4. Optimized the compatibility of a few APPs.
5. Optimized the fluency when using the camera.
You can search the update through the two ways below:
1. All tasks–System update–Check update
2. Setting–About–System update–Check update
Download here: ASUS Zenfone 2 (ZE551ML) 4GB RAM Smartphone Firmware