Latest Facebook Messenger 320 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 9; Redmi Note 5 Build/PKQ1.180904.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/320.0.0.13.123;] Android 9 Redmi Note 5
Mozilla/5.0 (Linux; Android 9; POCOPHONE F1 Build/PKQ1.180729.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/320.0.0.13.123;] Android 9 Pocophone F1
Mozilla/5.0 (Linux; Android 9; moto e6 play Build/POAS29.550-132-13; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/320.0.0.13.123;] Android 9 Moto E6 Play
Mozilla/5.0 (Linux; Android 9; JKM-LX3 Build/HUAWEIJKM-L23; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/320.0.0.13.123;] Android 9 Y9 (2019)
Mozilla/5.0 (Linux; Android 9; FIG-LX1 Build/HUAWEIFIG-L11; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/320.0.0.13.123;] Android 9 P smart
Mozilla/5.0 (Linux; Android 9; CPH2083 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/320.0.0.13.123;] Android 9 A12
Mozilla/5.0 (Linux; Android 9; ANE-LX1 Build/HUAWEIANE-L21; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/320.0.0.13.123;] Android 9 P20 Lite
Mozilla/5.0 (Linux; Android 8.1.0; XP8800 Build/8A.0.6-13-8.1.0-10.92.00; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/320.0.0.13.123;] Android 8 XP8
Mozilla/5.0 (Linux; Android 8.1.0; vivo 1808 Build/O11019; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/85.0.4183.127 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/320.0.0.13.123;] Android 8 Y81
Mozilla/5.0 (Linux; Android 8.1.0; SM-J530F Build/M1AJQ; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/320.0.0.13.123;] Android 8 Galaxy J5 (2017)
Mozilla/5.0 (Linux; Android 8.0.0; SM-G930F Build/R16NW; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/90.0.4430.91 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/320.0.0.13.123;] Android 8 Galaxy S7
Mozilla/5.0 (Linux; Android 8.0.0; Moto Z2 Play Build/OPSS27.76-12-25-23; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/320.0.0.13.123;] Android 8 Moto Z2 Play
Mozilla/5.0 (Linux; Android 8.0.0; AGS2-W09 Build/HUAWEIAGS2-W09; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Safari/537.36 [FB_IAB/Orca-Android;FBAV/320.0.0.13.123;] Android 8 MediaPad T5 10
Mozilla/5.0 (Linux; Android 5.1.1; SM-J500H Build/LMY48B; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/92.0.4515.159 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/320.0.0.13.123;] Android 5 Galaxy J5 (2015)
Mozilla/5.0 (Linux; Android 5.1.1; SM-G531H Build/LMY48B; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/95.0.4638.74 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/320.0.0.13.123;] Android 5 Galaxy Grand Prime
Mozilla/5.0 (Linux; Android 5.1.1; A37fw Build/LMY47V; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/320.0.0.13.123;] Android 5 A37fw
Mozilla/5.0 (Linux; Android 11; vivo 1920 Build/RP1A.200720.012; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/87.0.4280.141 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/320.0.0.13.123;] Android 11 S1 Pro
Mozilla/5.0 (Linux; Android 11; SM-M426B Build/RP1A.200720.012; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/87.0.4280.141 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/320.0.0.13.123;] Android 11 Galaxy M42 5G
Mozilla/5.0 (Linux; Android 11; SM-M325F Build/RP1A.200720.012; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/91.0.4472.120 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/320.0.0.13.123;] Android 11 Galaxy M32
Mozilla/5.0 (Linux; Android 11; SM-G990U Build/RP1A.200720.012; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/87.0.4280.141 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/320.0.0.13.123;] Android 11 Galaxy S21 FE 5G