Short story here *smile*. Bought an unlocked S10, and noticed that updates weren't coming. Still on the May 1 update in early August didn' t make me happy. So I flashed T-Mobile firmware and got up to the July 1 update real quick.
Next I got tired of the little T-Mobile tune that my phone played at boot time, so flashed back to unlocked firmware. I didn't have a SIM in the phone at the time that I flashed it...not only did I get the July 1 updates again, but also found "Night" in the camera modes. And my phone doesn't play the T-Mobile theme song during boot.
Win-win in my book. Got the firmware from SamMobile, took the latest "USA" firmware for the SM-G973U1. Downhill from there, Odin's a breeze, happy with my born-again unlocked S10 *smile*.