[LG Nitro HD] aamirrajpoot:
DISCLAIMER: Not my work, Tutorial followed from : http://choimobile.vn/threads/unbrick-lg-lu6200-ghim-cap-qhsusb-khong-thao-may.8448.html

Hi

I have been using LU6200 from last one year, and I loved this phone. I have tested many roms, and was using 4.4.2 CM11 rom. Then I installed an app from Play store, which modified the kernel, and booted my phone.

At this stage, my phone was totally dead, no screen indication, no light, no sound. Only one thing, is that when I connect my USB cable to computer, my computer try to install driver and also make sound of USB connection and disconnection.

So below are he steps which I have performed

MUST: KEEP YOUR PHONE ATTACHED WITH USB CABLE TO PC

Download the following files

http://pan.baidu.com/share/link?shareid=547069&uk=3071575749 <-USB DRIVER

http://pan.baidu.com/share/link?shareid=547084&uk=3071575749 <-Softwares

http://www.mediafire.com/download/ed4zec8itgjh37t/unbricklu6200.rar

Winhex - Forensic or Specialist version full not evaluation and registered. I have found only one version [WinHex 17.SR1.rar] which worked for me, not remember where from I downloaded this

Follow this tutorial http://www.howtogeek.com/167723/how...8.1-so-that-you-can-install-unsigned-drivers/ to run your OS in Advance mood where we have to disable DRIVER SIGNATURE ENFORCEMENT

When you have booted into windows after disabling driver signature, install the 1st Link file,

Install the Driver, when Installed it will show a COM Port installed, QUALCOMM one

Install the Softwares, default path will be C:\Program Files (x86)\Qualcomm\QPST\bin\

You also have items in your start menu, so run

1, In the "Start Menu" -> "QPST" -> "QPST Configuration" RUN This

2, Select the tab "PORT" and click "Add New Port ..."

3. A new window will open where the COM port which is newlly added to your system will be listed, select that port and add that

Keep that running

4 Go to the "Start Menu" -> "QPST" -> eMMC Software Downloadapp " RUN THIS

4.1 Uncheck, Program MMC Device

4.2 Click Browse, it displayed me PHONE ATTACHED with QUALCOM details near the top right of the image, where No ports Active is written

4.3 Check Search Path 2 and Browse to you files, where you have downloaded 3rd file. Which contains one hex, one img and mbn file

4.4 In the Flash Programming File name, enter the name of hex file

4.5 in boot image, enter the mbn file name

4.6 Click DOWNLOAD

at this point, it mounted me a 200kb drive which was not formatted. I have formatted that, and then kept this program running in the background as well

5. Winhex

5.1 Run Winhex, Make sure you have forensic version, and also Full version ,there are evolution version too, but that will not work. FULL VERSION and FORENSIC/SPECIALIST License is must

5.2 In Winhex, go to "File", "Restore Image", Change the file type from "WHX" to "Raw Image container"

5.5 Select lu6200.img from the 3rd file downloaded

5.5 Now it will ask for Target disc

5.6 Carefully select the QUALCOM, or else you will be formating your own HDD

5.7 In this window click OK

Now it will start giving your some strange, nasty warnings, just keep pressing OK, and Yes Continue Ok, etc etc

When that will finish, you phone will auto restart.

Now you may have to reflash that, or wipe it and install the KDZ ICS engineer version again. As right now My phone is in boot loop but I guess that can be fixed.

Tutorial followed from : http://choimobile.vn/threads/unbrick-lg-lu6200-ghim-cap-qhsusb-khong-thao-may.8448.html