Latest Facebook Lite 20 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 4.2.2; es-la; GT-S7580L Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30[FBAN/EMA;FBLC/es_LA;FBAV/20.0.0.9.4;] Android 4 Galaxy Trend Plus
Mozilla/5.0 (Linux; U; Android 4.1.2; es-la; GT-S5310E Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30[FBAN/EMA;FBLC/es_LA;FBAV/20.0.0.9.4;] Android 4 Galaxy POCKET Neo
Mozilla/5.0 (Linux; Android 6.0; TECNO W5 Lite Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/55.0.2883.91 Mobile Safari/537.36[FBAN/EMA;FBLC/fr_FR;FBAV/20.0.0.9.4;] Android 6 W5 Lite