Mi9 flashing miui 10 V10.2.16.0. mobile internet 4g problem


Feb 6, 2021
So I wanted too try difference in battery drain between latest miui 12 stable android 10 vs miui 10 android 9 stable. Everything went perfect but when system booted up I could not get mobile internet too work. It says 4g in status bar, but there is no internet. I have setup the right APN etc. I tried restarting, factory reset etc but no solution.
Steps I did:
-in twrp format data
-via otg flashed the v10.2.16.0
-format data again.
-booted into system
Any solution to this problem? Thanks
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