Latest Facebook Messenger 250 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 9; SNE-LX1 Build/HUAWEISNE-L21; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/250.0.0.12.117;] Android 9 Mate 20 Lite
Mozilla/5.0 (Linux; Android 9; SM-J530F Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/250.0.0.12.117;] Android 9 Galaxy J5 (2017)
Mozilla/5.0 (Linux; Android 9; SM-G960W Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/250.0.0.12.117;] Android 9 Galaxy S9
Mozilla/5.0 (Linux; Android 9; SM-G960F Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/79.0.3945.136 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/250.0.0.11.117;] Android 9 Galaxy S9
Mozilla/5.0 (Linux; Android 9; RMX1941 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/71.0.3578.99 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/250.0.0.12.117;] Android 9 C2
Mozilla/5.0 (Linux; Android 9; Redmi Note 8 Pro Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/250.0.0.12.117;] Android 9 Redmi Note 8 Pro
Mozilla/5.0 (Linux; Android 9; Redmi 7A Build/PKQ1.190319.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.117 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/250.0.0.12.117;] Android 9 Redmi 7A
Mozilla/5.0 (Linux; Android 9; MAR-LX3A Build/HUAWEIMAR-L03A; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/250.0.0.12.117;] Android 9 P30 Lite
Mozilla/5.0 (Linux; Android 9; MAR-LX1A Build/HUAWEIMAR-L21A; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/250.0.0.12.117;] Android 9 P30 Lite
Mozilla/5.0 (Linux; Android 9; LM-X420 Build/PKQ1.190522.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/79.0.3945.136 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/250.0.0.12.117;] Android 9 K40
Mozilla/5.0 (Linux; Android 9; LG-H870 Build/PKQ1.190522.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/250.0.0.12.117;] Android 9 G6
Mozilla/5.0 (Linux; Android 9; JSN-L22 Build/HONORJSN-L22; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/79.0.3945.136 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/250.0.0.12.117;] Android 9 Honor 8X
Mozilla/5.0 (Linux; Android 9; JKM-LX2 Build/HUAWEIJKM-LX2; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/78.0.3904.108 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/250.0.0.12.117;] Android 9 Y9 (2019)
Mozilla/5.0 (Linux; Android 9; FIG-LX1 Build/HUAWEIFIG-L31; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/250.0.0.12.117;] Android 9 P smart
Mozilla/5.0 (Linux; Android 9; BND-L21 Build/HONORBND-L21; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/250.0.0.12.117;] Android 9 Honor 7X
Mozilla/5.0 (Linux; Android 9; ANE-LX1 Build/HUAWEIANE-L21; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/250.0.0.12.117;] Android 9 P20 Lite
Mozilla/5.0 (Linux; Android 8.1.0; SM-J701F Build/M1AJQ; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/250.0.0.12.117;] Android 8 Galaxy J7 Core
Mozilla/5.0 (Linux; Android 8.1.0; Redmi 6A Build/O11019; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.99 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/250.0.0.12.117;] Android 8 Redmi 6A
Mozilla/5.0 (Linux; Android 8.0.0; SM-G930V Build/R16NW; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/79.0.3945.136 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/250.0.0.12.117;] Android 8 Galaxy S7
Mozilla/5.0 (Linux; Android 8.0.0; SM-A720F Build/R16NW; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/79.0.3945.136 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/250.0.0.12.117;] Android 8 Galaxy A7 (2017)