Latest Facebook Messenger 388 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 8.1.0; SM-G610F Build/M1AJQ; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/107.0.5304.141 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/388.0.0.23.106;] Android 8 Galaxy J7 Prime
Mozilla/5.0 (Linux; Android 8.1.0; CPH1901 Build/OPM1.171019.026; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/388.0.0.23.106;] Android 8 A7
Mozilla/5.0 (Linux; Android 8.1.0; Allure M3 Build/O11019; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/108.0.5359.128 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/388.0.0.23.106;] Android 8 Allure M3
Mozilla/5.0 (Linux; Android 6.0; UMI_SUPER Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/106.0.5249.126 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/388.0.0.23.106;] Android 6 Super
Mozilla/5.0 (Linux; Android 13; I2202 Build/TP1A.220624.014; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/107.0.5304.141 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/388.0.0.23.106;] Android 13 iQOO Z6
Mozilla/5.0 (Linux; Android 12; T602DL Build/SP1A.210812.016; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/97.0.4692.98 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/388.0.0.23.106;] Android 12 30 Z
Mozilla/5.0 (Linux; Android 11; Premier5 Build/R01005; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/107.0.5304.141 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/388.0.0.23.106;] Android 11 Premier 5
Mozilla/5.0 (Linux; Android 11; Nokia C01 Plus Build/RP1A.201005.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/97.0.4692.70 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/388.0.0.23.106;] Android 11 C01 Plus
Mozilla/5.0 (Linux; Android 11; C5L Build/RP1A.201005.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/107.0.5304.141 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/388.0.0.23.106;] Android 11 C5L
Mozilla/5.0 (Linux; Android 11; A509DL Build/RP1A.200720.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/94.0.4606.85 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/388.0.0.23.106;] Android 11 A3
Mozilla/5.0 (Linux; Android 10; Z555 Build/QP1A.190711.020; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/107.0.5304.141 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/388.0.0.23.106;] Android 10 Liquid Z555
Mozilla/5.0 (Linux; Android 10; vivo 1805 Build/QP1A.190711.020; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/100.0.4896.79 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/388.0.0.23.106;] Android 10 Nex
Mozilla/5.0 (Linux; Android 10; RC545L Build/ORB545L_V1.4.0_BVZPP; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/108.0.5359.79 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/388.0.0.23.106;] Android 10 Maui
Mozilla/5.0 (Linux; Android 10; OnePlus Nord Build/QQ3A.200805.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/97.0.4692.98 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/388.0.0.23.106;] Android 10 Nord
Mozilla/5.0 (Linux; Android 10; HPP-L55B Build/QP1A.190711.020; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/88.0.4324.181 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/388.0.0.23.106;] Android 10 Serrano
Mozilla/5.0 (Linux; Android 10; D65LX Build/QP1A.190711.020; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/107.0.5304.141 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/388.0.0.23.106;] Android 10 Seren D65LX