Latest Facebook Messenger 184 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 8.0.0; TA-1020 Build/O00623; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.100 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/184.0.0.30.93;] Android 8 3
Mozilla/5.0 (Linux; Android 8.0.0; SM-G930T Build/R16NW; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.100 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/184.0.0.30.93;] Android 8 Galaxy S7
Mozilla/5.0 (Linux; Android 7.0; PRA-LX1 Build/HUAWEIPRA-LX1; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.100 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/184.0.0.30.93;] Android 7 P8 Lite (2017)
Mozilla/5.0 (Linux; Android 6.0; LG-X230YK Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.100 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/184.0.0.30.93;] Android 6 X230YK
Mozilla/5.0 (Linux; Android 6.0; CRO-L03 Build/HUAWEICRO-L03; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.100 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/184.0.0.30.93;] Android 6 Y5 Lite (2017)
Mozilla/5.0 (Linux; Android 5.1.1; SM-G531M Build/LMY48B; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.100 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/184.0.0.30.93;] Android 5 Galaxy Grand Prime VE Duos
Mozilla/5.0 (Linux; Android 5.0.1; ALE-L02 Build/HuaweiALE-L02; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.100 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/184.0.0.30.93;] Android 5 P8 Lite (2015)
Mozilla/5.0 (Linux; Android 4.4.2; G735-L03 Build/HuaweiG735-L03) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/30.0.0.0 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/184.0.0.30.93;] Android 4 G Play