Flashing a router with unofficial firmware or a "dump" file (often found in .rar format) carries significant risks:
GitHub issues, such as those in the zte-config-utility repository , contain technical discussions about decrypting and flashing these specific models. How to Update Safely Flashing a router with unofficial firmware or a
If your router is still functional, the safest way to update is through the internal management page: product - ZTE Support Flashing a router with unofficial firmware or a