The Wayback Machine - https://web.archive.org/web/20131216141103/http://sontrak.com:80/index.html

The new firmware reset your LTE Band Aggregation settings. Log into the engineering menu ( http://192.168.8.1/html/index.html ). Navigate to "Network Settings" > "LTE Band". Uncheck "All bands" and manually select only the bands your tower uses (e.g., B3 + B7). Top firmware relies on manual tuning.

The Huawei B311221 is a popular 4G LTE Cat6 router, prized for its ability to convert a 4G SIM signal into a robust Wi-Fi and Ethernet connection. It supports Carrier Aggregation (LTE-A), offering download speeds up to 300 Mbps.

If your device is an enterprise model, you can find software packages at Huawei Enterprise Software Download .

You need a translated browser and a free account to view downloads. Files are typically hosted on Yandex Disk or Google Drive.