After these steps, your ZTE MF253S should be successfully unlocked. You can now try SIM cards from different carriers to verify it's working.
Click the "Start" or "Write" button within the software. The application will begin erasing the old carrier software and writing the new unlocked firmware. The process usually takes between 3 to 5 minutes. Step 6: Factory Reset and Verification zte mf253s unlock firmware
The hardware itself is praised for solid Wi-Fi performance and excellent signal strength. Security Note: After these steps, your ZTE MF253S should be
Try a different USB port, preferably a USB 2.0 port on the back of the motherboard. After these steps