Sometimes, generic ZTE firmware lacks the specific calibration required for the hardware components provided by the ISP (such as specific Wi-Fi drivers or DSL chipset tweaks). This can result in slower speeds or Wi-Fi instability.
Therefore, a firmware version such as V2.0.0P1T4 may work perfectly on one ISP’s OLT but fail to register on another’s due to differing OMCI managed entities or authentication methods (e.g., LOID versus serial number). Cross-flashing is often impossible without specialized tools and carries a high risk of bricking the device. zte zxv10 b866v2 firmware