Latest Smooth Mobile S2 Advance user agents:

User Agent	Browser	Platform
Mozilla/5.0 (Linux; Android 8.1.0; S2 Advance) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.181 Mobile Safari/537.36	Chrome Mobile 88	Android 8
Mozilla/5.0 (Linux; Android 8.1.0; S2 Advance) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Mobile Safari/537.36	Chrome Mobile 81	Android 8