The ROM memory used in smartphones and tablets etc. is often same as flash memory found in SD cards and USB flash drives, simply optimized for better speed and performance while running the operating system. The “stock ROM” comes installed on the phone or tablet, while a “custom ROM” comes from a third party. The custom ROM is either a uniquely modified OS, such as Lineage os, Cyanogen, Ressurection Remix or a stock version made available for older devices or for new devices before the vendor release date. If you have a device with a Qualcomm CPU and you want to know how to use QPST (Qualcomm Product Support Tool) for firmware flashing, below is a tutorial to help you flash stock ROM (.MBN) file to any compatible device.
QPST Tool can be used to flash the firmware to devices with Qualcomm chips.
Requirements:
Qualcomm QPST – Download 
Qualcomm Firmware in the required format.

Make sure your device is charged to at least 50%.

How To Flash Qualcomm .MBN Firmware Using QPST Tool

Step 1:- Download and install Qualcomm Driver from the link above. While installing driver avoids using cable for successful installation.

Step 2:- After Successful completed, connect your smartphone to the PC using a USB cable.

Step 3:- While connecting to PC, the phone should be switched off and press Volume up and Down buttons as boot key.

Step 4:–  If it shows Qualcomm HS-USB QDLoader in device manager like in the image below, then the drivers have been successfully installed.

Step 5:– Now, Run QFIL (Qualcomm Flash Image Loader) Tool.

 

Step 6:- Now Click on Browse tab under Select Programmer & Select the .MBN File.

.mbn File Format:

Step 7:– When you select the .MBN file, Select Build will automatically load the Update or Stock ROM.

Step 8:– Now Click on the Load XML & select rawprogram_unsparse_without_qcn.xml and then choose Patch0.xml

         Load XML comes with two option:

  1. rawprogram_unsparse_without_qcn.xml : On choosing this file, data will not be lost.
  2. rawprogram_unsparse.xml: Will lose RF Calibration data, IMEI and WiFi/Bluetooth Address.
Step 9:– Now Switch off your smartphone and connect it to PC while pressing Volume up & Down buttons & Click on Select Port and choose the port.

 

Step 10:– Finally Click on Download tab to start flashing.
Step 11: The firmware flashing process will start immediately, and it will take 1-2 minute to get completed.
Step 12: Now close the Upgrade Download Flash tool and unplug your Android smartphone from the PC and Start your Device. The first boot may take 5-10 minutes. Don’t panic and don’t try to restart or force shutdown during first boot.

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