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Zenfone Max M2 Pro Not Charging Up, Sudden switch off and battery at 50%

Star I
My max m2 pro is having a lot of issues after I updated the recent FOTA update after July.
It started showing battery issues. It'll be charged upto xyz% but will show 50% everytime. Also the battery section in the settings menu gets disappeared. And sometimes the phone tells that NO SIM CARD DETECTED.
It get switch off and do not turns on. Even if I leave it in Charging but it'll try to open on its own but do not turns ON.
What can I do if it is not even switching on .
Pls help!

Community Legend II
Hi Rawat1406
Thank you for your asking. Most of your issue does not happen in my device with WW-17.2018.2004.424 or WW-16.2017.2007.094. Not to mention the battery section is disappeared from Settings. Kindly provide the information below so that we can better assist you.
1. Have you ever unlocked or rooted your device before?
2. Your current firmware version
Settings>System>About Phone>Build Number
3. Try "the Factory Reset" 
Settings>System>Advanced>Reset options>Erase all data(factory reset)
Please note that once the Factory Reset is completed, all data, apps, settings and personal information will be deleted.