Latest Facebook Messenger 141 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 4.0.4; ru-ru; MB865 Build/6.7.2_EDEM-18) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/Orca-Android;FBAV/141.0.0.31.76;] Android 4 MB865
Mozilla/5.0 (Linux; Android 7.0; STARTRAIL 9 Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/55.0.2883.91 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/141.0.0.31.76;] Android 7 StarTrail 9
Mozilla/5.0 (Linux; Android 7.0; STARNAUTE4 Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.98 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/141.0.0.31.76;] Android 7 StarNaute 4
Mozilla/5.0 (Linux; Android 7.0; SM-J730F Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.98 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/141.0.0.31.76;] Android 7 Galaxy J7 Pro
Mozilla/5.0 (Linux; Android 7.0; SM-J530F Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.98 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/141.0.0.31.76;] Android 7 Galaxy J5 (2017)
Mozilla/5.0 (Linux; Android 7.0; SM-G930F Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.98 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/141.0.0.31.76;] Android 7 Galaxy S7
Mozilla/5.0 (Linux; Android 7.0; SM-G920F Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.98 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/141.0.0.31.76;] Android 7 Galaxy S6
Mozilla/5.0 (Linux; Android 7.0; HUAWEI VNS-L31 Build/HUAWEIVNS-L31; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.98 Mobile Safari/537.36 [FB_IAB/MESSENGER;FBAV/141.0.0.31.76;] Android 7 P9 Lite
Mozilla/5.0 (Linux; Android 7.0; EVA-L09 Build/HUAWEIEVA-L09; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.98 Mobile Safari/537.36 [FB_IAB/MESSENGER;FBAV/141.0.0.31.76;] Android 7 P9
Mozilla/5.0 (Linux; Android 7.0; ASUS_Z012D Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.98 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/141.0.0.31.76;] Android 7 ZenFone 3
Mozilla/5.0 (Linux; Android 7.0; ASUS_X008D Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.98 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/141.0.0.31.76;] Android 7 ZenFone 3 Max
Mozilla/5.0 (Linux; Android 6.0; U FEEL Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.98 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/141.0.0.31.76;] Android 6 U Feel
Mozilla/5.0 (Linux; Android 6.0; JERRY Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/62.0.3202.84 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/141.0.0.31.76;] Android 6 Jerry
Mozilla/5.0 (Linux; Android 6.0; HUAWEI VNS-L31 Build/HUAWEIVNS-L31; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/52.0.2743.98 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/141.0.0.31.76;] Android 6 P9 Lite
Mozilla/5.0 (Linux; Android 6.0; HTC One M9 Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.98 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/141.0.0.31.76;] Android 6 One M9
Mozilla/5.0 (Linux; Android 6.0; E5603 Build/30.2.A.1.21; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.98 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/141.0.0.31.76;] Android 6 Xperia M5
Mozilla/5.0 (Linux; Android 6.0; 5010X Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/52.0.2743.98 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/141.0.0.31.76;] Android 6 One Touch Pixi 4 5" 3G
Mozilla/5.0 (Linux; Android 6.0.1; SM-J700M Build/MMB29K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.98 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/141.0.0.31.76;] Android 6 Galaxy J7
Mozilla/5.0 (Linux; Android 6.0.1; SM-J500FN Build/MMB29M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.98 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/141.0.0.31.76;] Android 6 Galaxy J5 (2015)
Mozilla/5.0 (Linux; Android 6.0.1; SM-A300FU Build/MMB29M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.98 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/141.0.0.31.76;] Android 6 Galaxy A3 (2015)