Latest Facebook Messenger 188 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 8.1.0; DRA-LX3 Build/HUAWEIDRA-LX3; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/70.0.3538.80 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/188.0.0.33.100;] Android 8 Y5 (2018)
Mozilla/5.0 (Linux; Android 8.1.0; DRA-LX3 Build/HUAWEIDRA-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/188.0.0.33.100;] Android 8 Y5 (2018)
Mozilla/5.0 (Linux; Android 8.0.0; STF-L09 Build/HUAWEISTF-L09; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.100 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/188.0.0.33.100;] Android 8 Honor 9
Mozilla/5.0 (Linux; Android 8.0.0; LDN-LX3 Build/HUAWEILDN-LX3; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/70.0.3538.64 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/188.0.0.33.100;] 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/188.0.0.33.100;] Android 8 Y9 (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/69.0.3497.100 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/188.0.0.33.100;] 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/68.0.3440.91 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/188.0.0.33.100;] Android 8 Y6 (2018)
Mozilla/5.0 (Linux; Android 7.1.1; SM-J250M Build/NMF26X; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/70.0.3538.64 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/188.0.0.33.100;] Android 7 Galaxy J2 Pro
Mozilla/5.0 (Linux; Android 7.0; HTC 10 Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/69.0.3497.100 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/188.0.0.33.100;] Android 7 10
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/188.0.0.13.100;] 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/188.0.0.33.100;] 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/188.0.0.33.100;] Android 6 K8 (2017)
Mozilla/5.0 (Linux; Android 6.0; HUAWEI VNS-L23 Build/HUAWEIVNS-L23; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/70.0.3538.64 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/188.0.0.33.100;] Android 6 P9 Lite
Mozilla/5.0 (Linux; Android 6.0.1; LG-M154 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/188.0.0.33.100;] Android 6 Risio 2
Mozilla/5.0 (Linux; Android 5.1.1; SM-J200M Build/LMY47X; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/70.0.3538.80 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/188.0.0.33.100;] Android 5 Galaxy J2
Mozilla/5.0 (Linux; Android 5.1.1; SM-J200M Build/LMY47X; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/70.0.3538.64 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/188.0.0.33.100;] Android 5 Galaxy J2
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/188.0.0.33.100;] Android 5 Galaxy J2
Mozilla/5.0 (Linux; Android 4.4.2; SM-G357M Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/30.0.0.0 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/188.0.0.33.100;] Android 4 Galaxy Ace Style
Mozilla/5.0 (Linux; Android 4.4.2; G735-L23 Build/HuaweiG735-L23) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/30.0.0.0 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/188.0.0.33.100;] Android 4 G Play
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/188.0.0.33.100;] Android 4 G Play