Latest Facebook Messenger 321 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 9; vivo 1723 Build/PKQ1.190118.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.164 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/321.0.0.16.119;] Android 9 V9
Mozilla/5.0 (Linux; Android 9; SM-N950F Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/321.0.0.16.119;] Android 9 Galaxy Note 8
Mozilla/5.0 (Linux; Android 9; SM-M205FN Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/321.0.0.16.119;] Android 9 Galaxy M20
Mozilla/5.0 (Linux; Android 9; SM-J330FN Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.101 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/321.0.0.16.119;] Android 9 Galaxy J3 (2017)
Mozilla/5.0 (Linux; Android 9; SM-G885F Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/321.0.0.16.119;] Android 9 Galaxy A8 Star
Mozilla/5.0 (Linux; Android 9; SM-A600G Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/83.0.4103.96 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/321.0.0.16.119;] Android 9 Galaxy A6
Mozilla/5.0 (Linux; Android 9; SM-A307GN Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.164 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/321.0.0.16.119;] Android 9 Galaxy A30s
Mozilla/5.0 (Linux; Android 9; SM-A205FN Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/321.0.0.16.119;] Android 9 Galaxy A20
Mozilla/5.0 (Linux; Android 9; Redmi Note 8T Build/PKQ1.190616.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/321.0.0.16.119;] Android 9 Redmi Note 8T
Mozilla/5.0 (Linux; Android 9; Redmi Note 8 Build/PKQ1.190616.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/321.0.0.16.119;] Android 9 Redmi Note 8
Mozilla/5.0 (Linux; Android 9; Redmi 6 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/321.0.0.16.119;] Android 9 Redmi 6
Mozilla/5.0 (Linux; Android 9; Primo G9 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/321.0.0.16.119;] Android 9 Primo G9
Mozilla/5.0 (Linux; Android 9; MRD-LX3 Build/HUAWEIMRD-LX3; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.164 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/321.0.0.16.119;] Android 9 Y6 (2019)
Mozilla/5.0 (Linux; Android 9; LYA-L29 Build/HUAWEILYA-L29; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/93.0.4577.62 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/321.0.0.16.119;] Android 9 Mate 20 Pro
Mozilla/5.0 (Linux; Android 9; INE-LX2r Build/HUAWEIINE-LX2r; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/90.0.4430.210 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/321.0.0.16.119;] Android 9 Nova 3i
Mozilla/5.0 (Linux; Android 9; FIG-LX1 Build/HUAWEIFIG-L31; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/321.0.0.16.119;] Android 9 P smart
Mozilla/5.0 (Linux; Android 8.1.0; vivo 1820 Build/O11019; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/321.0.0.16.119;] Android 8 Y91i
Mozilla/5.0 (Linux; Android 8.1.0; vivo 1811 Build/OPM1.171019.026; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.164 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/321.0.0.16.119;] Android 8 Y91
Mozilla/5.0 (Linux; Android 8.1.0; SM-G610F Build/M1AJQ; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.164 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/321.0.0.16.119;] Android 8 Galaxy J7 Prime
Mozilla/5.0 (Linux; Android 8.1.0; Moto G (5) Build/OPPS28.85-13-6; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/321.0.0.16.119;] Android 8 Moto G5