After a long wait, finally Samsung released stable Android 9 Pie (One UI) update for Galaxy S9 and S9 Plus. The One UI update is currently available for European and Asian regions Galaxy S9 (SM-G960F) and Galaxy S9 Plus (SM-G965F). If you want to install the Android 9 Pie update manually on Galaxy S9/S9 Plus, you can download the One UI firmware from below and install it via Odin tool.