So this appears to be an issue more with Tmobile users, but others may be getting it as well. After I did the Smart-Switch software reset with my PC I was still enrolled in beta. Chatting with a customer service rep on the Samsung+ app, he told me to look in my app drawer for Samsung Members and it was now there. In Samsung Members app was the option to deregister and I tapped on it. You still have Oreo installed, and a box pops up saying the OS will be updated to the most recent stable version....at some point. Something to that effect.
I then made the mistake of doing a factory reset, which just reinstalled Oreo beta. After you deregister in the Samsung Members app you need to use the Smart Switch software and connect the phone to your PC via USB cable. Smart Switch on the PC then shows you will be installing the most recent non-beta OS which is of course Android 7.0.
My phone is now downloading all my apps (for the third time in 18 hours) and I will soon go through the process of setting up/logging back into my accounts.
Summary observations:
- Samsung+ rep was actually helpful - never even knew the app or assistance service existed
- Thanks to the poster here who first posted the idea of using Smart Switch
- It is MUCH easier to set up a phone from a factory reset if you a) back up everything to Samsung Cloud and b) use a launcher like Nova, where you can back up and restore all your home screen settings/widgets/app locations/wallpapers/icons etc. etc. You still have to log back into everything, but at least this gets you 75% of the way there.
- The unintuitive way Samsung has handled the deregister process sucks big hairy coconuts. There is no reason whatsoever I should have had to go through the hoops I did to deregister and roll back to stable software. Garbage.
Ok gotta go, having a tatoo done that says "Never Install Beta OS Again - Nevah Evah"