Latest Facebook Messenger 238 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 9; TECNO KB2h Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/71.0.3578.99 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/238.0.0.14.120;] Android 9 Pop 2S
Mozilla/5.0 (Linux; Android 9; MRD-LX1F Build/HUAWEIMRD-LX1F; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.99 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/238.0.0.14.120;] Android 9 Y6 (2019)
Mozilla/5.0 (Linux; Android 9; Mi A1 Build/PKQ1.180917.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/72.0.3626.121 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/238.0.0.14.120;] Android 9 Mi A1
Mozilla/5.0 (Linux; Android 8.0.0; PRA-LX1 Build/HUAWEIPRA-LX1; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/78.0.3904.62 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/238.0.0.14.120;] Android 8 P8 Lite (2017)
Mozilla/5.0 (Linux; Android 6.0; MTS-T0 Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/48.0.2531.0 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/238.0.0.14.120;] Android 6 N2M
Mozilla/5.0 (Linux; Android 6.0.1; SM-G532M Build/MMB29T; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/55.0.2883.91 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/238.0.0.14.120;] Android 6 Galaxy J2 Prime
Mozilla/5.0 (Linux; Android 5.1.1; A37f Build/LMY47V; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/46.0.2490.76 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/238.0.0.14.120;] Android 5 A37f
Mozilla/5.0 (Linux; Android 4.4.2; SM-G7102 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/238.0.0.14.120;] Android 4 Galaxy Grand 2