Latest Facebook Messenger 171 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 4.2.2; pt-pt; GT-S7582 Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/Orca-Android;FBAV/171.0.0.28.108;] Android 4 Galaxy S DUOS 2
Mozilla/5.0 (Linux; Android 8.1.0; Nokia 1 Build/O11019; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/64.0.3282.137 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/171.0.0.28.108;] Android 8 1
Mozilla/5.0 (Linux; Android 8.1.0; CLT-L29 Build/HUAWEICLT-L29; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/67.0.3396.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/171.0.0.28.108;] Android 8 P20 Pro
Mozilla/5.0 (Linux; Android 8.0.0; VTR-L09 Build/HUAWEIVTR-L09; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/67.0.3396.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/171.0.0.28.108;] Android 8 P10
Mozilla/5.0 (Linux; Android 8.0.0; STF-L09 Build/HUAWEISTF-L09; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/67.0.3396.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/171.0.0.28.108;] Android 8 Honor 9
Mozilla/5.0 (Linux; Android 8.0.0; SM-N950F Build/R16NW; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/67.0.3396.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/171.0.0.28.108;] Android 8 Galaxy Note 8
Mozilla/5.0 (Linux; Android 8.0.0; SM-G935F Build/R16NW; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/67.0.3396.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/171.0.0.28.108;] Android 8 Galaxy S7 Edge
Mozilla/5.0 (Linux; Android 8.0.0; SM-G930F Build/R16NW; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/67.0.3396.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/171.0.0.28.108;] Android 8 Galaxy S7
Mozilla/5.0 (Linux; Android 8.0.0; SM-A320FL Build/R16NW; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/67.0.3396.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/171.0.0.28.108;] Android 8 Galaxy A3 (2017)
Mozilla/5.0 (Linux; Android 8.0.0; Mi A1 Build/OPR1.170623.026; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/67.0.3396.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/171.0.0.28.108;] Android 8 Mi A1
Mozilla/5.0 (Linux; Android 8.0.0; MI 6 Build/OPR1.170623.027; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/67.0.3396.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/171.0.0.28.108;] Android 8 Mi 6
Mozilla/5.0 (Linux; Android 8.0.0; BLA-L29 Build/HUAWEIBLA-L29S; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/64.0.3282.137 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/171.0.0.28.108;] Android 8 Mate 10 Pro
Mozilla/5.0 (Linux; Android 8.0.0; ASUS_Z017D Build/OPR1.170623.026; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/67.0.3396.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/171.0.0.28.108;] Android 8 ZenFone 3
Mozilla/5.0 (Linux; Android 7.1.2; Redmi 5A Build/N2G47H; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/59.0.3071.125 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/171.0.0.28.108;] Android 7 Redmi 5A
Mozilla/5.0 (Linux; Android 7.1.2; Redmi 5 Plus Build/N2G47H; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/67.0.3396.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/171.0.0.28.108;] Android 7 Redmi 5 Plus
Mozilla/5.0 (Linux; Android 7.1.2; Redmi 4X Build/N2G47H; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/67.0.3396.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/171.0.0.28.108;] Android 7 Redmi 4X
Mozilla/5.0 (Linux; Android 7.1.1; U FEEL PRIME Build/NMF26F; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/67.0.3396.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/171.0.0.28.108;] Android 7 U Feel Prime
Mozilla/5.0 (Linux; Android 7.1.1; U FEEL PRIME Build/NMF26F; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/55.0.2883.91 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/171.0.0.28.108;] Android 7 U Feel Prime
Mozilla/5.0 (Linux; Android 7.1.1; SM-J510FN Build/NMF26X; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/67.0.3396.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/171.0.0.28.108;] Android 7 Galaxy J5 (2016)
Mozilla/5.0 (Linux; Android 7.1.1; Nokia 2 Build/NMF26F; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.126 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/171.0.0.28.108;] Android 7 2