Samsung has released the Android 16-based stable One UI 8 update for the Galaxy S21 FE. It has firmware version G990EXXUIHYJ2, comes with the September 2025 Android security patch, and requires a download of more than 2GB.
Samsung Galaxy S21 FE 5G
The One UI 8 stable update for the Samsung Galaxy S21 FE is currently being seeded in Vietnam and Thailand, but the rollout should expand to other countries soon.

Samsung Galaxy S21 FE
If you live in any of these countries and haven’t received the stable One UI 8 on your Samsung Galaxy S21 FE yet, you can check for the update manually by heading to the phone’s Settings > Software update menu.