Latest Facebook Messenger 254 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 9; SM-J730G Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.132 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/254.0.0.17.122;] Android 9 Galaxy J7 Pro
Mozilla/5.0 (Linux; Android 9; SM-G950F Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.132 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/254.0.0.17.122;] 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/96.0.4664.104 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/254.0.0.17.122;] Android 9 Galaxy A8
Mozilla/5.0 (Linux; Android 9; SM-A530F Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.132 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/254.0.0.17.122;] Android 9 Galaxy A8
Mozilla/5.0 (Linux; Android 9; SM-A205U Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.132 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/254.0.0.17.122;] Android 9 Galaxy A20
Mozilla/5.0 (Linux; Android 9; Redmi Note 7 Build/PKQ1.180904.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.132 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/254.0.0.17.122;] Android 9 Redmi Note 7
Mozilla/5.0 (Linux; Android 9; Mi A2 Lite Build/PKQ1.180917.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.132 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/254.0.0.17.122;] Android 9 Mi A2 Lite
Mozilla/5.0 (Linux; Android 9; MI 8 SE Build/PKQ1.181121.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.132 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/254.0.0.17.122;] Android 9 Mi 8 SE
Mozilla/5.0 (Linux; Android 8.1.0; Infinix X572 Build/O11019; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.132 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/254.0.0.17.122;] Android 8 Note 4
Mozilla/5.0 (Linux; Android 8.0.0; SM-A320FL Build/R16NW; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.132 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/254.0.0.17.122;] Android 8 Galaxy A3 (2017)
Mozilla/5.0 (Linux; Android 7.1.1; SM-J510FN Build/NMF26X; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.132 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/254.0.0.17.122;] Android 7 Galaxy J5 (2016)
Mozilla/5.0 (Linux; Android 10; SM-G960F Build/QP1A.190711.020; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.132 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/254.0.0.17.122;] Android 10 Galaxy S9
Mozilla/5.0 (Linux; Android 10; SM-A105M Build/QP1A.190711.020; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/79.0.3945.116 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/254.0.0.17.122;] Android 10 Galaxy A10
Mozilla/5.0 (Linux; Android 10; POT-LX1 Build/HUAWEIPOT-L21; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/74.0.3729.186 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/254.0.0.17.122;] Android 10 P smart (2019)
Mozilla/5.0 (Linux; Android 10; LYA-L29 Build/HUAWEILYA-L29; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.132 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/254.0.0.17.122;] Android 10 Mate 20 Pro