Have you downloaded the LG up version from lg? I believe I had to do that for my phone to work for some reason. I remember right after I downloaded the actual version and still ran the other version it worked. That or make sure you have all of your drivers the LG ones downloaded and installedOkay. Yes, I get that it will go from Android 8 back to 7. But when I follow the instructions in Post #1, I still get an error from LG UP that says "DLL for H91020h is invalid".