Samsung Galaxy S21 Ultra Android 15
Samsung Galaxy S21 Ultra Android 15
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Latest Galaxy S21 Ultra & Android 15 Updates
February 14, 2026: Rollout of the February Security Patch, addressing critical vulnerabilities and refining the "Liquid Glass" animation transitions.
January 20, 2026: Launch of One UI 7.1 (Android 15) for the S21 Ultra series, introducing the redesigned notification shade and enhanced widget stacking.
December 05, 2025: Final Android 15 Beta 4 update, which finalized the "Predictive Back" gesture and improved 5G modem efficiency.
October 18, 2025: Update to Samsung Knox Matrix, enhancing cross-device security and credential syncing for S21 Ultra users.
September 11, 2025: Initial Android 15 (One UI 7.0) deployment, marking the beginning of the major platform transition for the S21 series.