Firmware [better] | Zte F680

ZTE releases security patches roughly twice a year, but most ISPs test these for 6-12 months before pushing them. If your firmware is more than 2 years old, you should ask for an update.

Updates the user interface or adds VPN support. Zte F680 Firmware

The ZTE F680 is equipped with a high-performance dual-band Wi-Fi module that operates on both the 2.4 GHz and 5 GHz frequencies. This allows the device to deliver high-speed wireless coverage while reducing interference. ZTE releases security patches roughly twice a year,

The F680 provides two POTS ports, four GE ports, one USB 2.0 port, one USB 3.0 port, and it supports 802.11b/g/n Wi-Fi @ 2.4G(3x3) Firmware Zte F680(24) - Alibaba.com four GE ports