Latest Samsung Galaxy S10 5G (SM-G977U) - ATT firmware
Samsung Galaxy S10 5G (SM-G977U) firmware for USA (AT&T) (ATT): 1 build in the SamMobile archive, newest first. The latest is G977UUCU7FUI2 (Android 11, built 3 September 2021). Open a build to download it, or switch region with the country selector.