Downgrade to unlock FRP lock?

Coming from GNote 3, totally new to LG devices.
Locked Verizon G6 V988T has Google FRP lock, trying to remove it.
After going through frp unlock process and getting to file manager, bringing up settings I am getting a reduced version of settings. Options are wifi and data only; and if you click more there's only bluetooth and hotspot. And that's it. So I have no way of enabling install from unknown sources, so that I can install slide.

When I use the other method where in chrome you search for a business number, hit call and it brings up the dial pad so that you can dial service menu, there's no response. Even dialing imei does not bring the imei ID number. Seems this is disabled too.

I have no idea what software version is installed currently but it seems those two options/routes have been disabled/blocked. So my thinking is to downgrade to 7.0, follow the FRP unlocking procedure. Then install TWRP, root it.

I cannot properly ID the correct older kdz file for this phone.
1-Can you guys confirm if my steps are the way to go in order to be able to unlock frp, and,
2-a link to the correct kdz version for this phone?