If you must update the firmware, following a safe procedure is critical. While the standard web interface method is often locked by the ISP, if you have verified file access, here is the general method as discussed by advanced users:
Navigate to the or Administration tab on the top menu bar. Select System Management > Software Upgrade . zte zxhn f670l epon firmware verified
What is the exact listed on your router sticker? What ISP network are you trying to connect this device to? If you must update the firmware, following a