Howto flash firmware chip Qualcomm with Qualcomm Flash Image Loader
Note: Keep in mind that prior to flash check out the battery time. It should be 20-30% charged.
Backup your device data including personal data before flashing or installing firmware on your device.
Step by step instructions
Step 1: Download the latest version Android USB Driver and install it on your computer.
Step 2: Download and extract Qualcomm Flash Image Loader , Opne QFIL.exe.
Step 3: Once QFIL is launched, you will be able to see the following screen on your PC.
Step 4: Now, turn of your device.
Step 5: Press and hold Volum UP key and connect the Device to the PC using USB Cable.
Step 6: Now, in the QFIL, choose Flat build and click in Browse Button and locate the your folder firmware (.mbn)
Step 7: Once, you have added the firmware file, QFIL will automatically load the Rest of the firmware data.
Step 8: Click on the Download button to begin the flashing process.
Waiting may take upto 10-15 min to complete. when complete, your device will be reboot automatically.
Follow detail video tutorials: