Zte F670 Firmware Update -

Many service providers hide the manual upgrade button to prevent users from disrupting their managed connections. If the option is missing, your ISP manages updates automatically over the air (OTA). You will need to contact their customer support to request a firmware push. Internet Stopped Working After Update

If your ISP allows user-initiated updates, or if you are using a standalone unit, you can attempt an update via the web browser. Zte F670 Firmware Update

After a successful firmware update: