Ensure your device is connected to a PC via a stable USB cable. You may need to use a test point (opening the device) to force it into "Boot Mode" if it is unresponsive.
The file provided by @IAMmwagalwa (a technician often found on YouTube @IAMmwagalwa MF927u.zip
The package usually contains an executable (.exe) file that performs the flashing or unlocking process automatically once the device is detected. Ensure your device is connected to a PC
After a successful unlock, you may need to log into the web interface (usually 192.168.0.1 ) using the default credentials "admin / admin" to configure your new APN. @IAMmwagalwa MF927u.zip