Towards the end of 2021, ZTE rolled out firmware version . This was a significant stability patch.
If you have a device from this era and want to verify the software: zte mc801a firmware 2021
Using older firmware means missing out on the latest security patches against modern web exploits. How to Check Your Current Version Towards the end of 2021, ZTE rolled out firmware version
: Reverse engineering of the firmware showed that specific fields ( wa_inner_version integrate_version ) were explicitly whitelisted for unauthenticated access. Firmware Management (2021 Context) Towards the end of 2021