Latest Fly Era Nano 4 user agents:

User Agent	Browser	Platform
UCWEB/2.0 (MIDP-2.0; U; Adr 4.1.2; en-US; IQ4490) U2/1.0.0 UCBrowser/8.8.0.332 U2/1.0.0 Mobile	UC Browser 8	Android 4
Mozilla/5.0 (Linux; U; Android 4.1.2; ru-ru; Fly IQ4490 Build/JZO57K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30	Android Browser	Android 4
Mozilla/5.0 (Linux; U; Android 4.1.2; en-US; IQ4490 Build/JZO57K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 UCBrowser/11.5.0.1015 U3/0.8.0 Mobile Safari/534.30	UC Browser 11	Android 4
Mozilla/5.0 (Linux; U; Android 4.1.2; en-US; IQ4490 Build/JZO57K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 UCBrowser/11.5.0.1015 (SpeedMode) U4/1.0 UCWEB/2.0 Mobile Safari/534.30	UC Browser 11	Android 4
Mozilla/5.0 (Linux; Android 4.1.2; IQ4490 Build/JZO57K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.76 Mobile Safari/537.36	Chrome Mobile 46	Android 4