Samsung Galaxy S21 (SM-G991U) firmware for Unknown (LLA): 1 build in the SamMobile archive, newest first. The latest is G991USQUCGXH1 (Android 14, built 9 August 2024). Open a build to download it, or switch region with the country selector.
We recommend using Samsung’s own utilities, Samsung Smart Switch and OTA (Over-the-air), to upgrade devices. Use SamMobile only if you are 100% sure about the risks involved in flashing
your device. SamMobile is not responsible for any damage caused by using the files on this website.
