Incremental Update from V1.5.0 to V1.5.2
1. Go to 'Setting' - 'About phone' - 'System updates'
2. Check the current version and select the Server and click the 'CHECK FOR UPDATE'.
3. If there are exist proper new OS, the program may recognize it. Please press 'DOWNLOAD' and you can use the new OS after rebooting the terminal.
