You will need to look for an "unbranded" or "global" generic ZTE firmware version to unlock all hardware capabilities, such as manual network band locking. Best Practices for a Smooth Update

Forcing the router to use specific frequencies for faster speeds.

| | Explanation | | :--- | :--- | | 4G+ Speed Drops | New firmware includes updated carrier aggregation profiles for your local towers. | | Wi-Fi 5 (802.11ac) Instability | Patches for the MTK or Qualcomm Wi-Fi chipset reduce dropped connections. | | SMS Function Broken | Carrier-specific fixes for SMS over LTE. | | Admin Page Timeout | Interfaces hang or log you out constantly; updates rebuild web server stability. | | Security Vulnerabilities | Prevents DNS hijacking or remote admin exploits. |