Log back in. Confirm the new version matches. Then perform a factory reset via the physical button again to clear residual NVRAM variables from the old firmware.
If the LOS (Loss of Signal) light blinks red after an update, the EPON/GPON settings might have been reset. You will need to re-enter your LOID or SN (Serial Number) provided by your ISP. zte zxhn f670l epon firmware verified
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4 Gigabit Ethernet (GE) ports, 1 Phone port (VoIP), and 1 USB 2.0 port. 1 Phone port (VoIP)