Latest Facebook Messenger 278 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 9; Zenfone Max Pro M1 Build/PQ1A.190105.004; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/85.0.4183.81 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/278.0.0.16.103;] Android 9 ZenFone Max Pro M1
Mozilla/5.0 (Linux; Android 9; vivo 1907_19 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/84.0.4147.125 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/278.0.0.16.103;] Android 9 V17 Neo
Mozilla/5.0 (Linux; Android 9; vivo 1907 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/84.0.4147.111 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/278.0.0.16.103;] Android 9 V17 Neo
Mozilla/5.0 (Linux; Android 9; vivo 1906 Build/PKQ1.190616.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/84.0.4147.125 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/278.0.0.16.103;] Android 9 Y11
Mozilla/5.0 (Linux; Android 9; vivo 1906 Build/PKQ1.190616.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/84.0.4147.111 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/278.0.0.16.103;] Android 9 Y11
Mozilla/5.0 (Linux; Android 9; vivo 1904 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/84.0.4147.125 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/278.0.0.16.103;] Android 9 Y12
Mozilla/5.0 (Linux; Android 9; vivo 1901 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/84.0.4147.125 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/278.0.0.16.103;] Android 9 Y15
Mozilla/5.0 (Linux; Android 9; vivo 1723 Build/PKQ1.190118.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/84.0.4147.125 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/278.0.0.16.103;] Android 9 V9
Mozilla/5.0 (Linux; Android 9; SM-J730G Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/84.0.4147.125 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/278.0.0.16.103;] Android 9 Galaxy J7 Pro
Mozilla/5.0 (Linux; Android 9; SM-J701MT Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/84.0.4147.125 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/278.0.0.16.103;] Android 9 Galaxy J7 Core
Mozilla/5.0 (Linux; Android 9; SM-J701F Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/84.0.4147.125 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/278.0.0.16.103;] Android 9 Galaxy J7 Core
Mozilla/5.0 (Linux; Android 9; SM-J530F Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/84.0.4147.125 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/278.0.0.16.103;] Android 9 Galaxy J5 (2017)
Mozilla/5.0 (Linux; Android 9; SM-G950F Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/84.0.4147.125 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/278.0.0.16.103;] Android 9 Galaxy S8
Mozilla/5.0 (Linux; Android 9; SM-A530F Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/84.0.4147.125 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/278.0.0.16.103;] Android 9 Galaxy A8
Mozilla/5.0 (Linux; Android 9; SM-A107F Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.117 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/278.0.0.16.103;] Android 9 Galaxy A10s
Mozilla/5.0 (Linux; Android 9; RMX1811 Build/PKQ1.190319.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/72.0.3626.121 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/278.0.0.16.103;] Android 9 C1
Mozilla/5.0 (Linux; Android 9; Redmi Note 8T Build/PKQ1.190616.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/84.0.4147.125 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/278.0.0.16.103;] Android 9 Redmi Note 8T
Mozilla/5.0 (Linux; Android 9; Redmi Note 8 Build/PKQ1.190616.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.162 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/278.0.0.16.103;] Android 9 Redmi Note 8
Mozilla/5.0 (Linux; Android 9; Redmi 6 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/84.0.4147.125 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/278.0.0.16.103;] Android 9 Redmi 6
Mozilla/5.0 (Linux; Android 9; POCO F1 Build/PKQ1.180729.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/84.0.4147.125 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/278.0.0.16.103;] Android 9 Pocophone F1