: Select the offline update option, browse for your downloaded .upd firmware file, and click Upgrade or Update .

: Do not turn off the power during this process. The device will automatically reboot once the installation is complete. Important Troubleshooting & Alternatives

The device will display a progress bar. or turn off the device. Once the update is 100% complete, the will automatically reboot.

To download the firmware update for your ZTE F670L:

Interpretation: The P1N4 part often indicates a patch level. You need an update where the base version matches (e.g., V6.x to a higher V6.x patch).