[G Pad 8.3 Q&A, Help & Troubleshooting] cyadron:
Hello

This is the process that I used to unbrick the LG G Pad 8.3 tablet.

Note 1: The operating system on my PC is Windows XP SP3 x86

Note 2: The same process should also work on LG G Pad 10.1 (With a different .tot file)

1. First of all you should make sure that the G Pad is detected when connected to the PC.

The device should be seen as QHSUSB_DLOAD in Other Devices section in Device Manager.

hxxp://i.imgur.com/IawJZq0.jpg

2. Install the QHSUSB Driver for your operating system.

The driver can be found here:

hxxp://mega.nz/#!HlpViaTJ!NPACjSQtTjGWdYIj3kHO3bGfmAotaSSQindmgRY9VJ4

I have used the driver from the "checked" folder.

Reconnect the tablet and you should now see the device as Qualcomm HS-USB QDLoader 9008 (COMxx) under the Ports section in Device Manager.

Take a note of the COM port number.

hxxp://i.imgur.com/IR7uUCB.png

3. Download the .tot image file for you tablet model.

I have used the one from here (LG G Pad 8.3 V500 4.4.2):

hxxp://androidfilehost.com/?fid=23329332407581518

4. Now you need the LG BoardDiag tool.

Download this one from here:

hxxp://mega.nz/#!XwgkXTAR!JnAAXKBQoezT7CcxRSVkSQlPFr4AXcvfm6oJbw4bht4

Please use only this one even if you have another BoardDiag. I have tried other versions and this was the only one that worked. For the other versions I always got some error:

failed during loading flash programmer

or

device not found in dload trying flash programmer

With this tool we will extract the .tot rom image first.

Unrar the archive and open BoardDiag3.99c application.

Click on the ... button next to BIN from the Image Extraction section on the bottom of the BoardDiag application and browse to the .tot file you downloaded at step 3.

Then click on the ... button next to DIR and browse to a folder to extract the files in.

Click on the Extract button and wait for the files to be extracted.

After the extraction is complete, close the BoardDiag application.

hxxp://i.imgur.com/Kw0ZhUv.jpg

5. Now we will perform some cheks on the tablet.

Open the BoardDiag application again.

Now select the AP check and EMMC TEST checkboxes from the Board Diag Test section on the top-left.

Also choose the G-pro (APQ8064) on the AP Chipset dropdown selection box. Choose the Com Port that you took a note of at step 2. Select as the Target Dir the folder where you extracted the .tot image file at step 4. These settings are in the top-right side of the BoardDiag application. Make no other changes to the settings.

Now Click on the big START button and wait for the checks to be made.

If everything is OK you should see under the Test Results section the green text PASS both under the AP and EMMC. Leave the BoardDiag application open. Now you can proceed to step 6.

6. Now we will Flash the files to the tablet.

Now you will also check the SDRAM TEST checkbox on the left top side of the BoardDiag application. The other settings were already made in step 5. Click the START button again.

After performing the checks you should see that the files from the image (aboot.mbn, boot.mbn, etc.) are written to the tablet.

After that, the BoardDiag tried to reset the tablet, but it failed and it ended with FAIL for SDRAM under the Test Results section. But the files were already written on the tablet.

7. After that I disconnected and reconnected the tablet to the PC. Nothing was detected, or so I thought, because I could see that in Device Manager something was happening. It was like refreshing itself every 5 seconds or so. I disconnected the tablet from the PC and I plugged in the wall charger. It turns out that the battery had no power.

After a few minutes the LG logo appeared on the screen. Nothing else was happening but I could see the LG logo. I left the tablet to charge the battery for at LEAST 3 hours. If your tablet battery is also discharged you should plug your tablet to the charger for at LEAST 3 hours.

After that I reconnected the tablet to the PC and it was detected as G Pad but it couldn't find the driver.

8. Install the LG Mobile Drivers.

You can get them from here:

hxxp://mega.nz/#!j8xikSYC!Njz3E1_PSJanzQEeZCbbEoWfxUz9TfrTVgusqBCJ2qY

After the driver installation reconnect the tablet to the PC.

It should now be connected properly.

9. Download LG Mobile Support Tool. You can use the launcher from here:

hxxp://mega.nz/#!bp5jgBQJ!xqiMyQU7z-ATlYz__0ybz2kM7boeLFNgqsu5XoPPSzo

Open LG Mobile Support Tool. You should now see the tablet is connected correctly and you should see the tablet model on the left side of the LG Mobile Support Tool. You will now go to Options and choose Upgrade Recovery. Wait for the image to be downloaded and flashed to the tablet.

After the process is completed the tablet will boot to life again.

Please write your comments bellow if you succeeded or failed. I will provide further assistance if required.

PS: I think you need to remove the battery and reinsert it after step 6. Or it could also work if you let the battery discharge completely.

Good luck!