LGv20 H910 Root Step by Step guide to install Oreo Stock & debloat, Wi-fi Ca...

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MORE ATT CRAP TO GET RID OF
In order to completely disable fota. i had to get rid of the following (i deleted anything in the system folder with fota in the file name):
/system/apps/lgfota
/system/etc/fota
/system/etc/terms/fota
/system/lib/libfotajni.so
/system/lib64/libfotajni.so
/system/etc/permissions/com.lge.fota.xml

There's also extra att bloatware to get rid of:
/system/app/vvm_att
/system/vendor/app/facebook-appmanager
/system/vendor/app/facebook
/system/vendor/app/directv_remote
/system/vendor/app/directv
/system/vendor/app/att_uber

The only att app you want to leave on the phone is /system/vendor/app/att_hotspots; wifi calling will not work without it.

Now, get ready for some weird stuff....
GOOGLE CRAP TO KEEP
These folders are split up among /system/app and /system/priv-app
googlepackageinstaller (keep to be able to install apk's)
googleextshared (phone boot loops without this)
googleextservices (phone boot loops without this)
webviewgoogle (aurora store at this moment seems to only work with the webview that came with the stock rom and it's browser and will work with no others)
chrome (aurora store at this moment seems to only work with the webview that came with the stock rom and it's browser and will work with no others)

Here's where it gets weirder, but if i figured it out for everyone, it wasn't easy...
GOOGLE CRAP TO GET RID OF AND KEEP WIFI CALLING FUNCTIONAL
This next part is specifically for degoogling and maintaining wifi calling without having google try to update apps the moment you get connected to wifi. I did this in two stages...

PART 1
Get rid of the following:
These folders are split up among /system/app and /system/priv-app
youtube
editors slides
editors sheets
editors docs
photos
maps
hangouts
phonesky
music
videos
google pay
gmail
latininlmegoogle
drive
calculator
velvet
driveactivator
tag
GoogleBackupTransport
GoogleContactsSyncAdapter
googlecalendarsyncadapter
google tts
hotwordenrollment (all hotword enrollment folders)
google in apps
talkback
GoogleFeedback
GooglePartnerSetup
GoogleOneTimeInitializer
SetupWizard

PART 2
After part 1 is complete
A. Boot into android.
B. Connect to wifi.
C. Activate wifi calling.
D. Verify wifi calling works (call your phone, have another phone call your phone, either or for that test).
E. Go into android settings and disable google play services and google framework, restart phone, then confirm wifi calling still works.
F. Reboot phone into twrp, remove gmscore and googleservicesframework (again, you'll find these folders among system/app and /system/priv-app).
G. Congratulations, you've degoogled as much as possible without clawing at the walls wondering why wifi calling isn't working after you degoogled.

MICROG?
Microg works very well on this phone. Microg is pretty much fake google services so you can still run normal apps from the play store.
1. Reboot into twrp and flash nanodroid patcher patckage. This patches the phone to allow signature spoofing; a requirement of microg.
2. Flash nanodroid microg package.
3. Reboot into android.
4. Open microg settings.
5. Go into "self-check" inside of microg settings, allow everything and check off all the boxes in there.
6. Get out of self-check and go into "google device registration" and turn that on.
7. Update to the latest version of aurora store since the nanodroid package include an old one.
8. Go into aurora store after you updated it, allow all it requires, keep it with the "session installer".
9. Once aurora store initial setup is complete, go into "blacklist manager" and check off all the boxes in there.
A. Aurora store will mistake microg as outdated and want to wipe it out with a google play services installation.
B. You don't want aurora store upgrading any of the android operating system files on your phone.
C. Doing this ensures that any app you install from aurora store afterward won't be blacklisted, and aurora store gets relegated for apps you installed and updates for those apps.
10. Consider installing fdroid so you can keep aurora store regularly updated with the newest version.
11. Congratulations, you've degoogled as much as possible without losing wifi calling and still run apps from the play store.

SHORTER BOOT TIME AND SHUTDOWN TIME
Delete the following to shave seconds off boot and shutdown time (your phone will have no more start up noise, turn on 5 seconds faster, and have no more shutdown animation since att's attempt at visualizing a shutdown was very odd).
/system/media/bootanimation.zip
/system/media/shutdownanimation.zip

You can actually get rid of the media folder, but do that if you don't want user interface sounds, or your typical alarm noises (and that's how you don't wake up to a silent alarm the next day if you delete this folder).