Latest Facebook Messenger 205 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 8.1.0; Redmi Note 5 Pro Build/OPM1.171019.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/72.0.3626.121 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/205.0.0.18.110;] Android 8 Redmi Note 5 Pro
Mozilla/5.0 (iPhone; CPU iPhone OS 12_0_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/16A404 [FBAN/MessengerForiOS;FBAV/205.0.0.45.108;FBBV/144617131;FBDV/iPhone8,4;FBMD/iPhone;FBSN/iOS;FBSV/12.0.1;FBSS/2;FBCR/2degrees;FBID/phone;F iOS 12 iPhone SE