Is there any way at all to upgrade my Samsung Galaxy S20 Ultra 5G (Snapdragon) to Android 13? It's stuck on Android 11, and I've been with Google Fi, and now US Mobile, with still no OTA updates ever available. It's:
- Model: SM-G988U (SM-G988UZKEXAA)
- CSC Country: USA/US
- Active CSC Code: XAA
- Bootloader/PDA/Baseband Version: G988USQS2DUE2
- CSC Version: G988UOYN2DUE2
It was sold to me brand new 2 years ago as "Unlocked," but Samsung checked the IMEI for me and told me it's "Originally Carrier Locked to Sprint but now T-Mobile."
A custom ROM would be awesome, but I'm totally happy just to finally get to upgrade to Android 12 or 13. I've read all over XDA, Reddit, etc, that an unrooted phone can be flashed with a non-custom ROM, but I can't find any definitive answer regarding this thing's unlockable bootloader getting in the way of that.
Do I have any hope here, without paying to unlock the bootloader? If so, can someone tell me exactly which firmware I should download and flash?