Latest Facebook 271 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 9; Wildfire R70 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/77.0.3865.92 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/271.0.0.55.109;] Android 9 Wildfire R70
Mozilla/5.0 (Linux; Android 9; W-V800-TVM Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/86.0.4240.198 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/271.0.0.55.109;] Android 9 View 3 Lite
Mozilla/5.0 (Linux; Android 9; vivo Z1i Build/PKQ1.180819.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/68.0.3440.91 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/271.0.0.55.109;] Android 9 Z1i
Mozilla/5.0 (Linux; Android 9; vivo Z1 Build/PKQ1.180819.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/68.0.3440.91 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/271.0.0.55.109;] Android 9 Z1
Mozilla/5.0 (Linux; Android 9; vivo 1904 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/74.0.3729.136 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/271.0.0.55.109;] Android 9 Y12
Mozilla/5.0 (Linux; Android 9; U304AA Build/P00610; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.138 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/271.0.0.55.109;] Android 9 Radiant Core
Mozilla/5.0 (Linux; Android 9; TECNO AB7 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.138 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/271.0.0.55.109;] Android 9 Phantom 9
Mozilla/5.0 (Linux; Android 9; SM-S767VL Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.138 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/271.0.0.55.109;] Android 9 Galaxy J7 Crown
Mozilla/5.0 (Linux; Android 9; SM-S260DL Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.138 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/271.0.0.55.109;] Android 9 Galaxy J2 Core
Mozilla/5.0 (Linux; Android 9; SM-S102DL Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.138 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/271.0.0.55.109;] Android 9 Galaxy A10e
Mozilla/5.0 (Linux; Android 9; SM-J737U Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.138 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/271.0.0.55.109;] Android 9 Galaxy J7 (2018)
Mozilla/5.0 (Linux; Android 9; SM-J737T Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.138 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/271.0.0.55.109;] Android 9 Galaxy J7 (2018)
Mozilla/5.0 (Linux; Android 9; SM-J737R4 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.138 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/271.0.0.55.109;] Android 9 Galaxy J7 (2018)
Mozilla/5.0 (Linux; Android 9; SM-J530F Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/76.0.3809.132 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/271.0.0.55.109;] Android 9 Galaxy J5 (2017)
Mozilla/5.0 (Linux; Android 9; SM-J530F Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/74.0.3729.136 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/271.0.0.55.109;] Android 9 Galaxy J5 (2017)
Mozilla/5.0 (Linux; Android 9; SM-J337U Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.138 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/271.0.0.55.109;] Android 9 Galaxy J3 (2018)
Mozilla/5.0 (Linux; Android 9; SM-J337A Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.138 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/271.0.0.55.109;] Android 9 Galaxy J3 (2018)
Mozilla/5.0 (Linux; Android 9; SM-A705X Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/83.0.4103.83 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/271.0.0.55.109;] Android 9 Galaxy A70
Mozilla/5.0 (Linux; Android 9; SM-A705X Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.138 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/271.0.0.55.109;] Android 9 Galaxy A70
Mozilla/5.0 (Linux; Android 9; SM-A530F Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/74.0.3729.136 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/271.0.0.55.109;] Android 9 Galaxy A8