How To Flash Qualcomm .MBN Firmware Using QPST Tool
QPST Tool can be used to flash firmware to devices with Qualcomm chips.
Requirements:
How To Flash Qualcomm .MBN Firmware Using QPST Tool
2. After installation is completed, connect Phone to PC using USB cable.
3. While connecting to PC, phone should be switched off and press Volume up and Down buttons as boot key.
4. If it shows Qualcomm HS-USB QDLoader *in device manager* like in the image below, then the drivers have been successfully installed.
Steps To Flash .MBN Firmware For Qualcomm Devices Via QPST Tool
1. QPST Tooland Drivers should be installed properly.
2. Make sure your device is charged to at least 50%.
3. Now, Run QFIL (Qualcomm Flash Image Loader) Tool.

4. Click on Browse... under Select Programmer to choose the .MBN File.

.mbn File Format:
6. Click on Load XML, select rawprogram_unsparse_without_qcn.xml and then choose Patch0.xml
Load XML comes with two option:
- rawprogram_unsparse_without_qcn.xml : On choosing this file, data will not be lost.
- rawprogram_unsparse.xml : Will lose RF Calibration data, IMEI and WiFi/Bluetooth Address.

7. Switch off the device and connect it to PC while pressing Volume up & Down buttons.
8. Click on Select Port and choose the port.

9. Click on Download to start flashing.

10. Once Finish Download appears, disconnect your device from the PC.
You just successfully flashed the firmware to your device using QPST.
If you find anything confusing, let us know via the comments box.