How to Install Nitrogen-OS Android 11 for Samsung Galaxy A50. Nitrogen-OS Android 11 Brought to you by: igors1974, it comes with GSI-OS Android 11 and basic feature only. This ROM Required: Installed TWRP Recovery. Version Information Status: Stable, Nitrogen-OS-11-arm64-ab-vanilla ( ARM64-AB ). Use at your own risk, I’m not responsible for bricking your device.