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mobile data stopped working after OxygenOS 5.1.6 update

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New member
Jun 12, 2018
I just had the OxygenOS 5.1.6 update on my Oneplus 6. and after reboot, I have lost the mobile data connectivity.
tried resetting network setting, but no use.
Also tried Hard reset (with the phone off) but of no use
Turn your phone off by pressing down the power key for five seconds.
Press and hold the volume key and power button simultaneously until the device vibrates and opens the Recovery menu.
Choose your preferred language.
Using the volume keys to navigate, go to Wipe > data cache > Confirm.
Reboot the device after this is done.

Can anyone help to resolve the issue or how to degrade to the previous version.
Is the factory reset the only option, please help.