Please tell us some basic information before asking for help:
Model Name: zb601kl
Firmware Version: mpm1
Rooted or not: no
Frequency of Occurrence: n.a.
APP Name & APP Version (If your issue relates to the app): fota
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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Post your feedback here (17.2017.2004.424).
Don't create multiple post for the same
1. Battery and performance
2. Speaker
3. Airtel vowifi
4. Camera 2api
5. Native video call
6. Others (any other improvements)