[LG G8X ThinQ Guides, News, & Discussion] Negan:
Hey guys, I like some of you had suffered from a broken LTE radio from the last security update which was November security patch. This has been driving me crazy the past couple of weeks. LG has acknowledged this as being a known issue and is instructing people to simply switch from GSM/WCDMA/LTE auto to GSM/WCDMA auto which does restore connection. This simply is not good enough and we cannot possibly be expected to settle for barely 3G speeds and just crap signal until they get their butts in gear and fix this. Anyway enough blabbing because realistically you just want the fix.

Below is the response LG has given which acknowledges the issue but by no means is an ideal fix.

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So the goal is to get our Preferred network mode set to LTE/CDMA which currently is not an option. So we need to make it an option manually.

So below I'm going to list all the things I've done. Some may not have actually been needed so I'll update and edit this accordingly based on feedback and thread participation. This takes about 5 minutes of messing around to make it happen.

It's not a bug it's a feature:

There is one known issue that I haven't tried to fix yet but it really isn't that big of a deal. Doing this seems to kill your voicemail shortcut when you open the dialer and long press 1. When you do so it does try to dial voicemail but tells you that your call cannot be completed. However you can access it still by simply dialing your own phone number. We're going to call this Collateral damage for the time being. I'll play around and see if I can get this working again but really not too many people leave a voicemail anymore so I'm not overly worried at this point.

If you want you can also contribute to this thread and if you find something that fixes this or notice anything below as being an extra step let me know and we can update this process accordingly. The key here is to note that these are all the steps I took to restore my LTE and it worked.

So first things first you need to tinker with activities. The easiest way to do this is downloading "Activity Launcher" .

Open up Activity launcher and let it load

Scroll down until you see Network and expand it. (you can just search for it too if you prefer)

Scroll down and select com.lge.networksettings.MobileNetworkSettingsForCMCC

Click on Network mode which may say "null"

Select the top option which is LTE/CDMA If you do not have the option of LTE/CDMA continue the rest of the steps and then move on to part 2

Directly below it select com.lge.networksettingsMobileNetworkSettingsForGLOBAL

Select Network mode (should show Preferred network mode: LTE/CDMA)

If not select network mode and choose LTE/CDMA

3 options below it, select com.lge.networksettings.MobileNetworkSettingsForSBM

toggle to the on postion: Use 4G data Network. This may take a second to show your network in the status bar icon again

Next directly below that select com.lge.networksettings.MobileNetworkSettingsForSKT

Under Network mode select LTE preferred

Done. All should be well now. Go ahead and test it out by send yourself some text messages or whatever but it should be all set now. If you mess something up do not panic you can simply reset your network settings by going into the settings app, selecting Network & internet and at the bottom selecting Network settings reset if you absolutely feel you need to.

Part 2

Open your dialer and enter *#*#4636#*#*

And see if you can change your preferred network to LTE/CDMA auto (PRL)

Under Network/Mobile networks check com.lge.networksettings.MobileNetworkSettingsForSP CS, network mode, select LTE/CDMA

Network/Network com.lge.networksettings.UPLMNEditor: choose GSM as your network preference then press the 3 dot menu to save

Scroll down to Settings and scroll way down to com.android.settings.BandMode and select automatic

Now go back to the Network activity and we're going to revisit the option that previously may not have been working. As a reminder it was com.lge.networksettings.MobileNetworkSettingsForCMCC

Click on Network mode which may say "null"

Select the top option which is LTE/CDMA

You should now be good to go!

Credits: LG for not fixing this in a timely manner and giving us the most ridiculous temp fix ever