Latest Advan M4 user agents:

User Agent	Browser	Platform
Mozilla/5.0 (Linux; U; Android 6.0; ADVAN M4 Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/44.0.2403.119 Mobile Safari/537.36 OPR/28.0.2254.119214	Opera Mobile 28	Android 6
Mozilla/5.0 (Linux; Android 6.0; ADVAN M4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.106 Mobile Safari/537.36	Chrome Mobile 83	Android 6
Mozilla/5.0 (Linux; Android 6.0; ADVAN M4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Mobile Safari/537.36	Chrome Mobile 76	Android 6
Mozilla/5.0 (Linux; Android 6.0; ADVAN M4 Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/44.0.2403.119 Mobile Safari/537.36[FBAN/EMA;FBLC/id_ID;FBAV/81.0.0.11.188;]	Facebook Lite 81	Android 6
Mozilla/5.0 (Linux; Android 6.0; ADVAN M4 Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/44.0.2403.119 Mobile Safari/537.36[FBAN/EMA;FBLC/id_ID;FBAV/292.0.0.9.109;]	Facebook Lite 292	Android 6
Mozilla/5.0 (Linux; Android 6.0; ADVAN M4 Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/44.0.2403.119 Mobile Safari/537.36 GSA/12.22.8.23.arm	Google Search App 12	Android 6
Mozilla/5.0 (Linux; Android 6.0; ADVAN M4 Build/MRA58K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.119 Mobile Safari/537.36	Chrome Mobile 44	Android 6