[LG G6 Guides, News, & Discussion] C.Q. Noob:
I have the LG G6 Plus from amazon LGUS997U. Since there is no way to unlock the bootloader, at least there is a way to disable all amazon software. The following steps were used on LG G6 plus but should be the same for LG G6 US997 from amazon.

This is a step by step guide for all noobs out there like me. I received the phone November 22th and did not update the software so my device has android security patch October 1, 2017.

1. Download and install LG mobile driver on your PC (sorry, can not post outside url)

lg.com/us/lgeai/Drivers/pages/mobile-drivers.html

2. Download and install ADB on your PC https://www.xda-developers.com/google-releases-separate-adb-and-fastboot-binary-downloads/

3. On your phone, go to Settings and tap on About Phone. Find the Build Number and tap on it 7 times to enable Developer Options.

4. Now enter Developer Options and find USB Debugging. Enable it.

5. Send a text message to your own number in order to have a notification and minimize amazon lock screen offers

6. Connect your phone to PC

7. Open ADB by double clicking "cmd-here.exe" and type "adb devices"

8. Now on your phone click ok to allow USB debugging

9. On adb type "adb shell"

10. Show the list of all amazon packages typing " pm list packages | grep 'amazon' "

11. At this point you should have a list of amazon packages and you can uninstall most of them with the following command

“pm uninstall -k --user 0 <name of package>”

more detailed steps can be found on https://www.xda-developers.com/uninstall-carrier-oem-bloatware-without-root-access/

11. The following packages can not be uninstalled

package: com.amazon.widgets

package: com.amazon.device.information.provider

package: com.amazon.phoenix

package: com.amazon.alphafirstrun

12. Disable all this packages using the following command pm disable-user --user 0 <name of package>

example

" pm disable-user --user 0 com.amazon.phoenix "

With this I do not see any ads on the lock screen of the phone even if rebooted. The only problem that I have is that you still have to double tap on the fingerprint reader in order to unlock the phone.

I hope it helps someone

Regards

EDITED

I am updating for those of you who after following the steps mention before ended up with a lockscreen wallpaper with ads.

13. Enable again the following packages

package: com.amazon.widgets

package: com.amazon.phoenix

example " pm enable com.amazon.phoenix "

14. Disconnect your phone from adb. You should have ads again on your lockscreen. Go to settings- lockscreen and select the wallpaper of your preference.

15. Send a text message (SMS) to your own number in order to have a notification and minimize amazon lock screen offers. Do not check the message we need the lockscreen minimized.

16. Enter again ADB and disable again the following packages

package: com.amazon.widgets

package: com.amazon.phoenix

example

" pm disable-user --user 0 com.amazon.phoenix "

At this point you should have remove any kind of ads on your lockscreen.

Unlock your phone with a single fingerprint tap

A. Remove any unlock security like Pattern, fingerprint or PIN etc.

B. Enable

package: com.amazon.widgets

package: com.amazon.phoenix

C. Disconnect your phone and lock and unlock your phone many times. You should see ads but they disappear.

D. Go to settings-Fingerprint & security and setup your fingerprint

E. Disable again

package: com.amazon.widgets

package: com.amazon.phoenix

Every time that you reboot your phone, you have to repeat the procedure again. Give it a try and hope it works for you.