WiFi Stability: Fixes for signal dropping or interference on the 2.4GHz and 5GHz bands.
If you find settings have disappeared after an update, your ISP may have restricted access. You may need to contact them for full administrative credentials. Zte Zxhn F670l Firmware Update
The ZXHN F670L is a favorite target for botnets (think Mirai variants). Why? Because default credentials and unpatched firmware are the low-hanging fruit of the cyber world. WiFi Stability: Fixes for signal dropping or interference