[G Pad 8.3 Q&A, Help & Troubleshooting] AmeliaAT:
Late answer here, but it should work fine.

---------- Post added at 06:30 PM ---------- Previous post was at 05:50 PM ----------

This is a little late to the game, but here's what worked for me on the wifi-only LG G Pad II 8.0 (v498), and it might help others.

I used Kingroot (4.8.2) to root the tablet, then used Supersume Pro from the Play Store to remove Kingroot and install Supersu. (I'd tried a couple other methods for removing Kingroot first, but they didn't work, and Supersume Pro (v. 9.3.7) nworked really quickly and with zero pain, so that's the method I'd recommend. It does cost a few bucks, but IMO, it was worth it for the ease of use.) It's working perfectly. (Supersume Pro is available at the Play store at: play.google.com/store/apps/details?id=darkslide.com.supersumepro -- can't post the link because I'm a new member.)

I've rooted before using clockwork mod, etc., on other devices, but Kingroot does make rooting simpler. If you don't trust Kingroot for rooting, another method might work, but I had trouble finding one specifically for this device.

Cons to using Kingroot (and keeping it):

1. It installs a cleaner app called "Purify" which you may or may not want, and which you have to install to get to the rooting screen. It can be uninstalled separately, though.

2. Kingroot really messed with my Okay Google app. It turns itself on in "Accessibility" mode (or however you might put that correctly), and when turned off from the Accessibility settings, Okay Google will work again. However, Kingroot "insists" on turning itself on in the Accessibility settings, and will keep resetting, overriding your setting. It may also hijack other aspects of the tablet that I didn't notice -- I replaced it with SuperSU shortly after rooting.

3. Many people are nervous about the amount of data sent to the Kingroot servers in China during the rooting process. I'm on the fence about whether it's dangerous or not. I think it potentially is -- regardless of the location or ownership of the servers -- but I have no idea whether it's *actually* dangerous or not. If that aspect worries you, you should try another method to root your tablet. I think I would have been more reluctant to use Kingroot if I had the version of this tablet with the sim card.

4. Kingroot is quite recalcitrant to removal and replacement. Two methods that I used to try to remove Kingroot (without unrooting the device) didn't work -- and even after the program was no longer on the tablet, I could not replace its su with a different binary. I had to reinstall and uninstall using SuperSume. I might have had better results replacing it with SuperSu manually if I'd been more patient, but I didn't want to spend too much time on it.

Pros to using Kingroot:

1. It's fast.

2. It requires little technical skill.

3. It can be removed and replaced with SuperSu (or, presumably, some other superuser manager), though that ranges from very easy (using SuperSume) to extremely difficult (especially if you don't play with rooting a lot -- and people with only one or two Android devices generally root once then forget it till the next time they need to root a new device, and so don't have a huge amount of experience with it).

I hope this helps someone!