Latest Facebook Lite 53 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 4.2.2; pt-pt; ALCATEL ONE TOUCH 7041X Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.2 Mobile Safari/534.30 SVN/090FPG1[FBAN/EMA;FBLC/pt_PT;FBAV/53.0.0.3.91;] Android 4 One Touch Pop C7
Mozilla/5.0 (Linux; Android 6.0; Pocket Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/54.0.2840.85 Mobile Safari/537.36[FBAN/EMA;FBLC/pt_PT;FBAV/53.0.0.3.91;] Android 6 Pocket
Mozilla/5.0 (Linux; Android 4.4.2; PCD_E400 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/30.0.0.0 Mobile Safari/537.36[FBAN/EMA;FBLC/es_LA;FBAV/53.0.0.3.91;] Android 4 E400