Latest Facebook Messenger 421 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 8.1.0; Twist 2 Pro Build/OPM2.171019.012; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/115.0.5790.166 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/421.0.0.12.61;] Android 8 Twist 2 Pro
Mozilla/5.0 (Linux; Android 13; V2247 Build/TP1A.220624.014; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/115.0.5790.138 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/421.0.0.12.61;] Android 13 Y36
Mozilla/5.0 (Linux; Android 13; SM-A515F Build/TP1A.220624.014; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/115.0.5790.138 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/421.0.0.12.61;] Android 13 Galaxy A51
Mozilla/5.0 (Linux; Android 13; RMX3395 Build/TP1A.220905.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/115.0.5790.166 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/421.0.0.12.61;] Android 13 Narzo 50 Pro
Mozilla/5.0 (Linux; Android 13; Pixel 6 Pro Build/TQ1A.221205.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/115.0.5790.166 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/421.0.0.12.61;] Android 13 Pixel 6 Pro
Mozilla/5.0 (Linux; Android 13; ANY-LX1 Build/HONORANY-L21CQ; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/115.0.5790.138 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/421.0.0.12.61;] Android 13 Magic 4 Lite
Mozilla/5.0 (Linux; Android 12; vivo 1907 Build/SP1A.210812.003; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/97.0.4692.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/421.0.0.12.61;] Android 12 V17 Neo
Mozilla/5.0 (Linux; Android 12; S6303L Build/SP1A.210812.016; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/115.0.5790.166 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/421.0.0.12.61;] Android 12 A9L
Mozilla/5.0 (Linux; Android 12; Lenovo TB-9707F Build/SKQ1.220213.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/115.0.5790.166 Safari/537.36 [FB_IAB/Orca-Android;FBAV/421.0.0.12.61;] Android 12 Legion Y700
Mozilla/5.0 (Linux; Android 11; SM-A505FN Build/RP1A.200720.012; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/115.0.5790.166 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/421.0.0.12.61;] Android 11 Galaxy A50
Mozilla/5.0 (Linux; Android 11; Note 6 Build/RP1A.201005.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/115.0.5790.166 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/421.0.0.12.61;] Android 11 Note 6
Mozilla/5.0 (Linux; Android 11; HIT P8 Build/RP1A.201005.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/115.0.5790.166 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/421.0.0.12.61;] Android 11 Hit P8
Mozilla/5.0 (Linux; Android 11; BL8800Pro Build/RP1A.200720.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/117.0.0.0 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/421.0.0.12.61;] Android 11 BL8800 Pro
Mozilla/5.0 (Linux; Android 10; S59 Build/QP1A.190711.020; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/115.0.5790.138 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/421.0.0.12.61;] Android 10 S59
Mozilla/5.0 (Linux; Android 10; S21 Plus 2021_EEA Build/QP1A.190711.020; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/115.0.5790.166 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/421.0.0.12.61;] Android 10 S21 Plus (2021)
Mozilla/5.0 (Linux; Android 10; ELE-L29 Build/HUAWEIELE-L29; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/115.0.5790.166 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/421.0.0.12.61;] Android 10 P30
Mozilla/5.0 (Linux; Android 10; CPH2185 Build/QP1A.190711.020; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/115.0.5790.166 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/421.0.0.12.61;] Android 10 A15