[G Pad 8.3 Q&A, Help & Troubleshooting] sheebie:
I just went thru this with my a G Pad 8.0, had quite a few hangups but I ended up figuring it out. Some suggestions from what I learned... :

- Fully charge up your tablet. Mine was charging extremely slow, so I left it plugged in overnight and that finally ended up doing the trick.

- Make sure you have the correct driver installed. If you go to LG's website and find their downloads section, you can search for your device and download its driver. I'm pretty sure their tablet driver isn't device specific, but so if you have any difficulty finding this, let me know and I can post the one that worked for me. After you download the file, don't forget to open and install it. While you're there, you can I'd just go ahead and re-download and reinstall their mobile support tool, just to make sure you've got the most current update. After it installs, open the program; I don't know if you have to, please let but I'd have it open and waiting before you do these next steps.

- Completely power off your device. Unplug it from the wall and turn it off. I found that if I just held down the power button until the screen went dark, my tablet 3would restart itself a few seconds later. But when I kept holding down the power bites dxton thru the reset, it would turn off a 2nd time and actually stay off (about 15sec or so).

- In order to run LG's support tool, you'll wanna boot into download mode. You can search for your device online and it should explain how to do this, I found a couple conflicting methods but I believe the one that worked for me was just by holding the volume up key and then plugging it in to your PC with a USB. If that doesn't work, try pressing the volume up and power keys together then plugging it in, or try pressing both of the volume keys. One of those 3 should have you entering download mode. It will take a few seconds after you attach the cord for you to boot up; keep holding down the keys you pressed until you see the download mode screen. When plugging it in, but I it might be easier to keep holding down the buttons if you start with the cord plugged into your powered off device, and and then plug the other end into your PC while you are doing the boot process. It shouldn't matter which end you connect last, and I found this method to be way less awkward.

- The LG mobile support tool should automatically recognize your device and automatically start the update, and but you might need to select your device yourself, or at least the service provider, in order to update correctly. Just DON'T unplug your tablet thru the entire process. I think the whole thing took me about 15 minutes, depends on your Internet speed really.

- if you've managed to successfully run the update and you're still stuck in a boot loop, you're gonna have to reset your device. Again, you can Google how to do this, but I think most LG's perform a hard reset by making sure the phone is turned off, then press and hold the power and volume down keys. When the LG logo appears, release the power key for a second while still holding down the volume key, and then press and hold power down again until you see the reset screen. Use your volume and power keys to factory reset your device.

Hopefully, now it is should be able to boot just fine! Let me know if you encounter any problems and I'll see what I can do to help.