If you decide to go the OpenWrt route, follow these general steps as outlined in the OpenWrt Wiki
Different regional versions of the MF286D firmware offer varying levels of control: zte mf286d firmware
In the world of mobile broadband, the has carved out a reputation as a workhorse. This 4G CAT6 router is a favorite among tech enthusiasts, remote workers, and rural internet users due to its support for carrier aggregation, external antenna ports, and dual-band Wi-Fi. If you decide to go the OpenWrt route,