ZenFone 5 unable to access network after update

edited September 2020 in ZenFone 5 Series
Model: ZE620KL
Firmware/APP Version: PPR1.80610.009.WW_user_90.11.162.98_20190816
Frequency of Occurrence: Always
Rooted: No
APP Name:

After an Asus system update, the phone is unable to detect the network signal.
The message from FOTA Service:
System has been updated
Tap to reboot system

appears constantly.

The network signal is extremely intermittent.
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