Never flash firmware over Wi-Fi. Connect your PC directly to one of the LAN ports on the ZTE F670L using an Ethernet cable.

Upgrading to the V9.0 firmware branch introduces several critical enhancements over older V6.0 or V8.0 versions:

Click on (sometimes labeled as Software Upgrade ).

Connect your computer directly to one of the LAN ports of the ZTE F670L using an Ethernet cable. Never attempt a firmware upgrade over Wi-Fi, as signal drops can corrupt the installation.

: For authorized updates, check the ZTE Support Portal or the ZTE Device Global Support page.

Resolves memory leak issues that previously forced users to frequently reboot the hardware. Risks of Manual Firmware Updates