This usually happens due to a driver conflict. Try a different USB port (preferably USB 2.0) and restart the process.
Contact their support via chat. Request the “firmware upgrade package for MF927U” – they can often email it. download zte mf927u firmware upd
Remove the back cover and battery. Look for the and S/N (Serial Number) . Also note the IMEI – some carrier updates are IMEI-locked. This usually happens due to a driver conflict
After updating, check that the firmware version has changed: Request the “firmware upgrade package for MF927U” –
Newer software patches vulnerabilities that could allow unauthorized access to your network.
The simplest way to check for and install a new update is directly through the router's built-in web portal. This method, often called an Over-the-Air (OTA) update, is the recommended way for most users if an update is available.