Latest Facebook Messenger 230 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 9; TA-1024 Build/PKQ1.181105.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/76.0.3809.132 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/230.0.0.12.117;] Android 9 5
Mozilla/5.0 (Linux; Android 9; SM-G950U Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/76.0.3809.132 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/230.0.0.12.117;] Android 9 Galaxy S8
Mozilla/5.0 (Linux; Android 9; SM-A750GN Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/74.0.3729.136 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/230.0.0.12.117;] Android 9 Galaxy A7 (2018)
Mozilla/5.0 (Linux; Android 9; CLT-L09 Build/HUAWEICLT-L09; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/76.0.3809.132 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/230.0.0.12.117;] Android 9 P20 Pro
Mozilla/5.0 (Linux; Android 8.1.0; SM-G615F Build/M1AJQ; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/70.0.3538.110 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/230.0.0.12.117;] Android 8 Galaxy J7 Max
Mozilla/5.0 (Linux; Android 7.1.1; CPH1723 Build/N6F26Q; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.117 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/230.0.0.12.117;] Android 7 F5
Mozilla/5.0 (Linux; Android 7.0; HUAWEI VNS-L21 Build/HUAWEIVNS-L21; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/59.0.3071.125 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/230.0.0.12.117;] Android 7 P9 Lite