No Network or unable to track Sim card Zenfone 5z

Whenever I restart the phone, the network is lost and it doesn't return for 2-3 days. If I try to call anyone, it says Aeroplane Mode is ON - which is actually Off.

Restarting phone - doesn't help

Reinserting Sim card - doesn't help (my sim works fine other phone and other person Sim doesn't work in my phone)

Sim card tray issue - No

Factory reset - Doesn't resolve

It seems it is a problem in latest Android 10 update - after that this problem is coming.

I read other people post on it - seems some Firmware issue. How to load older firmware - have got access to zip files of older firmware on Asus website for Zenfone 5z - but how to install it?

Please help or any alternative solution

Thanks and regards,

Sudhir

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