Latest Facebook Messenger Lite 286 user agents:

User Agent Platform Device
Mozilla/5.0 (iPhone; CPU iPhone OS 14_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 LightSpeed [FBAN/MessengerLiteForiOS;FBAV/286.0.0.26.118;FBBV/249868022;FBDV/iPhone12,3;FBMD/iPhone;FBSN/iOS;FBSV/14.1;FBSS/3;FBCR/;FBID/pho iOS 14 iPhone 11 Pro
Mozilla/5.0 (iPhone; CPU iPhone OS 13_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 LightSpeed [FBAN/MessengerLiteForiOS;FBAV/286.0.0.26.118;FBBV/249868022;FBD iOS 13 iPhone