Model Name: ZE620KL Zenfone 5 Firmware Version: WW_16.0615.2004.126-0 Rooted or not: Not Frequency of Occurrence: Every time phone is unplugged, using microphone. I have installed yesterday the update WW_16.0615.2004.126-0. And today,(not yesterday and I have not rebooted since), my phone is shutting down without any reason by ~30seconds after startup. I have to put it on charge so it doesn't stop. The battery status is 100% and green led. I tried a factory reset but it didn't work, still having the issue. Edit : it's not 30 seconds after startup. It is every time an app uses the microphone. When it is charging, the microphone is just not working. But when I unplug the phone and I try to use the microphone, it shutdowns the phone. How can I go back to previous version of firmware to see if it's a firmware issue or hardware ?