Latest Facebook 303 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 9; ZTE Blade A7 2020 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/88.0.4324.93 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/303.0.0.30.122;] Android 9 Blade A7 (2020)
Mozilla/5.0 (Linux; Android 9; ZTE Blade A7 2020 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/88.0.4324.141 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/303.0.0.30.122;] Android 9 Blade A7 (2020)
Mozilla/5.0 (Linux; Android 9; ZTE Blade A7 2020 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/77.0.3865.92 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/303.0.0.30.122;] Android 9 Blade A7 (2020)
Mozilla/5.0 (Linux; Android 9; ZTE Blade A5 2020 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/88.0.4324.93 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/303.0.0.30.122;] Android 9 Blade A5 (2020)
Mozilla/5.0 (Linux; Android 9; ZTE Blade A5 2020 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/77.0.3865.92 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/303.0.0.30.122;] Android 9 Blade A5 (2020)
Mozilla/5.0 (Linux; Android 9; ZTE Blade A5 2019 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/88.0.4324.93 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/303.0.0.30.122;] Android 9 Blade A5 (2019)
Mozilla/5.0 (Linux; Android 9; ZTE Blade A5 2019 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.99 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/303.0.0.30.122;] Android 9 Blade A5 (2019)
Mozilla/5.0 (Linux; Android 9; ZTE 2050 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/77.0.3865.92 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/303.0.0.30.122;] Android 9 Blade 20 Smart
Mozilla/5.0 (Linux; Android 9; X90L Build/P00610; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/71.0.3578.99 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/303.0.0.30.122;] Android 9 X90L
Mozilla/5.0 (Linux; Android 9; X4-SH Build/S1017; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/88.0.4324.93 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/303.0.0.30.122;] Android 9 Android One X4
Mozilla/5.0 (Linux; Android 9; X20 PRO Build/P00610; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/88.0.4324.93 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/303.0.0.30.122;] Android 9 X20 Pro
Mozilla/5.0 (Linux; Android 9; W-V800-EEA Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/88.0.4324.93 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/303.0.0.30.122;] Android 9 View 3 Lite
Mozilla/5.0 (Linux; Android 9; W-V720-EEA Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/88.0.4324.93 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/303.0.0.30.122;] Android 9 Y80
Mozilla/5.0 (Linux; Android 9; W-P311-EEA Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/88.0.4324.93 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/303.0.0.30.122;] Android 9 View 3
Mozilla/5.0 (Linux; Android 9; VKY-L29 Build/HUAWEIVKY-L29; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/88.0.4324.93 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/303.0.0.30.122;] Android 9 P10 Plus
Mozilla/5.0 (Linux; Android 9; VKY-L09 Build/HUAWEIVKY-L09; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/88.0.4324.93 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/303.0.0.30.122;] Android 9 P10 Plus
Mozilla/5.0 (Linux; Android 9; vivo 1806 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/86.0.4240.110 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/303.0.0.30.122;] Android 9 V11i
Mozilla/5.0 (Linux; Android 9; vivo 1804 Build/PKQ1.180819.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/83.0.4103.106 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/303.0.0.30.122;] Android 9 V11 Pro
Mozilla/5.0 (Linux; Android 9; VFD 730 Build/PKQ1.190407.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/88.0.4324.141 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/303.0.0.30.122;] Android 9 Smart V10
Mozilla/5.0 (Linux; Android 9; UMIDIGI X Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/88.0.4324.93 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/303.0.0.30.122;] Android 9 X