Latest Maxwest Nitro 4s user agents:

User Agent	Browser	Platform
Mozilla/5.0 (Linux; Android 6.0; Nitro_4s Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.138 Mobile Safari/537.36	Chrome Webview 81	Android 6
Mozilla/5.0 (Linux; Android 6.0; Nitro_4s Build/MRA58K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.91 Mobile Safari/537.36	Chrome Mobile 55	Android 6