Latest Facebook Messenger Lite 321 user agents:

User Agent Platform Device
Mozilla/5.0 (iPhone; CPU iPhone OS 14_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 LightSpeed [FBAN/MessengerLiteForiOS;FBAV/321.0.0.35.120;FBBV/304137363;FBDV/iPhone13,4;FBMD/iPhone;FBSN/iOS;FBSV/14.6;FBSS/3;FBCR/;FBID/pho iOS 14 iPhone 12 Pro Max
Mozilla/5.0 (iPhone; CPU iPhone OS 14_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 LightSpeed [FBAN/MessengerLiteForiOS;FBAV/321.0.0.35.120;FBBV/304137363;FBDV/iPhone12,5;FBMD/iPhone;FBSN/iOS;FBSV/14.6;FBSS/3;FBCR/;FBID/pho iOS 14 iPhone 11 Pro Max
Mozilla/5.0 (iPhone; CPU iPhone OS 14_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 LightSpeed [FBAN/MessengerLiteForiOS;FBAV/321.0.0.35.120;FBBV/304137363;FBDV/iPhone12,1;FBMD/iPhone;FBSN/iOS;FBSV/14.6;FBSS/2;FBCR/;FBID/pho iOS 14 iPhone 11
Mozilla/5.0 (iPhone; CPU iPhone OS 12_5_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 LightSpeed [FBAN/MessengerLiteForiOS;FBAV/321.0.0.35.120;FBBV/304137363;FBDV/iPhone7,2;FBMD/iPhone;FBSN/iOS;FBSV/12.5.3;FBSS/2;FBCR/;FBID/ iOS 12 iPhone 6
Mozilla/5.0 (iPad; CPU OS 14_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 LightSpeed [FBAN/MessengerLiteForiOS;FBAV/321.0.0.35.120;FBBV/304137363;FBDV/iPad13,6;FBMD/iPad;FBSN/iOS;FBSV/14.6;FBSS/2;FBCR/;FBID/tablet;FBLC/en;F iPadOS 14 iPad Pro 3 11"
Dalvik/2.1.0 (Android 6.0.0; iCherry_C258 Build/ZNR71W) [FBAN/MessengerLite;FBAV/321.0.0.4.51;FBPN/com.facebook.mlite;FBLC/id_ID;FBBV/293513921;FBCR/Meizu;FBMF/Facebook;Facebook/lge;FBDV/L-03K;FBSV/9;FBCA Android 6 Style