Based on internal release notes from ZTE and ISPs (such as China Telecom, Telmex, Ooredoo, and Telenet), the fixed V9.0 firmware includes the following corrections:
: Supports simultaneous 2.4GHz (300Mbps) and 5GHz (866Mbps) for a combined Wi-Fi speed of up to 1.2Gbps. Zte F670l V9.0 Firmware Fixed
: The firmware update process can sometimes be complex and may require technical knowledge. If you're not confident, it's advisable to seek help from a professional or your ISP's technical support. ZTE F670L V9
(Requires serial console or boot-loop detection) Example test results (mock)