Latest Facebook Messenger 186 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 4.1.2; fr-fr; GT-I9128 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/Orca-Android;FBAV/186.0.0.26.85;] Android 4 Galaxy Grand
Mozilla/5.0 (Linux; Android 8.0.0; LDN-LX3 Build/HUAWEILDN-LX3; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.100 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/186.0.0.26.85;] Android 8 Y7 (2018)
Mozilla/5.0 (Linux; Android 8.0.0; FLA-LX3 Build/HUAWEIFLA-LX3; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.100 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/186.0.0.26.85;] Android 8 Y9 (2018)
Mozilla/5.0 (Linux; Android 8.0.0; FIG-LX3 Build/HUAWEIFIG-LX3; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.100 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/186.0.0.26.85;] Android 8 P smart
Mozilla/5.0 (Linux; Android 8.0.0; ATU-LX3 Build/HUAWEIATU-LX3; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.100 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/186.0.0.26.85;] Android 8 Y6 (2018)
Mozilla/5.0 (Linux; Android 8.0.0; ATU-LX3 Build/HUAWEIATU-LX3; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.126 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/186.0.0.26.85;] Android 8 Y6 (2018)
Mozilla/5.0 (Linux; Android 7.0; TRT-LX3 Build/HUAWEITRT-LX3; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.100 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/186.0.0.26.85;] Android 7 Y7 (2017)
Mozilla/5.0 (Linux; Android 7.0; TRT-L53 Build/HUAWEITRT-L53; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.100 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/186.0.0.26.85;] Android 7 Y7 Prime (2018)
Mozilla/5.0 (Linux; Android 7.0; BLL-L23 Build/HUAWEIBLL-L23; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.100 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/186.0.0.26.85;] Android 7 Mate 9 Lite
Mozilla/5.0 (Linux; Android 6.0; MYA-L03 Build/HUAWEIMYA-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/186.0.0.26.85;] Android 6 Y5 (2017)
Mozilla/5.0 (Linux; Android 6.0; MYA-L02 Build/HUAWEIMYA-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/186.0.0.26.85;] Android 6 Y5 (2017)
Mozilla/5.0 (Linux; Android 6.0; LG-X240 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/186.0.0.26.85;] Android 6 K8 (2017)
Mozilla/5.0 (Linux; Android 6.0; LG-K580 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/186.0.0.26.85;] Android 6 X Cam
Mozilla/5.0 (Linux; Android 6.0; LG-K371 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/186.0.0.26.85;] Android 6 Phoenix 2
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/186.0.0.26.85;] Android 6 Y5 Lite (2017)
Mozilla/5.0 (Linux; Android 6.0.1; LG-K450 Build/MXB48T; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/70.0.3538.80 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/186.0.0.26.85;] Android 6 K450
Mozilla/5.0 (Linux; Android 6.0.1; LG-K240 Build/MXB48T; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.100 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/186.0.0.26.85;] Android 6 K240
Mozilla/5.0 (Linux; Android 5.1.1; SM-J200M Build/LMY47X; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.100 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/186.0.0.26.85;] Android 5 Galaxy J2
Mozilla/5.0 (Linux; Android 5.1.1; SM-J111M Build/LMY47V; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.100 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/186.0.0.26.85;] Android 5 Galaxy J1 Ace
Mozilla/5.0 (Linux; Android 5.1.1; LG-H735 Build/LMY47V; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.100 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/186.0.0.26.85;] Android 5 G4 Beat