Latest Plum Optimax 7 user agents:

User Agent	Browser	Platform
Mozilla/5.0 (Linux; Android 6.0; PLUM Z709) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Safari/537.36	Chrome 76	Android 6
Mozilla/5.0 (Linux; Android 6.0; PLUM Z709 Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/72.0.3626.121 Safari/537.36 GSA/9.36.4.21.arm	Google Search App 9	Android 6