Latest Facebook Messenger 220 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 9; POT-LX1T Build/HUAWEIPOT-LX1T; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/75.0.3770.101 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/220.0.0.20.121;] Android 9 P smart (2019)
Mozilla/5.0 (Linux; Android 9; ANE-LX2J Build/HUAWEIANE-L42J; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/85.0.4183.101 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/220.0.0.20.121;] Android 9 P20 Lite
Mozilla/5.0 (Linux; Android 8.1.0; Nexus 5X Build/OPM7.181205.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/75.0.3770.101 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/220.0.0.20.121;] Android 8 Nexus 5X
Mozilla/5.0 (Linux; Android 6.0.1; SM-G900F Build/MMB29M) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/72.0.3626.105 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/220.0.0.20.121;] Android 6 Galaxy S5
Mozilla/5.0 (Linux; Android 5.1.1; SM-J320F Build/LMY47V; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/75.0.3770.101 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/220.0.0.20.121;] Android 5 Galaxy J3 (2016)
Mozilla/5.0 (Linux; Android 5.1.1; HUAWEI Y560-L01 Build/HUAWEIY560-L01; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/75.0.3770.101 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/220.0.0.20.121;] Android 5 Ascend Y560