Latest Facebook Messenger 117 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 4.1.2; pt-pt; GT-N7105 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/MESSENGER;FBAV/117.0.0.17.70;] Android 4 Galaxy Note II LTE
Mozilla/5.0 (Linux; Android 6.0; VFD 700 Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/52.0.2743.98 Mobile Safari/537.36 [FB_IAB/MESSENGER;FBAV/117.0.0.17.70;] Android 6 Smart Ultra 7
Mozilla/5.0 (Linux; Android 6.0; ALE-L21 Build/HuaweiALE-L21; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/55.0.2883.91 Mobile Safari/537.36 [FB_IAB/MESSENGER;FBAV/117.0.0.17.70;] Android 6 P8 Lite (2015)
Mozilla/5.0 (Linux; Android 5.1.1; SM-J500FN Build/LMY48B; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/58.0.3029.83 Mobile Safari/537.36 [FB_IAB/MESSENGER;FBAV/117.0.0.17.70;] Android 5 Galaxy J5 (2015)
Mozilla/5.0 (Linux; Android 5.1.1; SM-J500F Build/LMY48B; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/58.0.3029.83 Mobile Safari/537.36 [FB_IAB/MESSENGER;FBAV/117.0.0.17.70;] Android 5 Galaxy J5 (2015)