Look at the picture above, if your F660's curcuit board is the same, you can sure that it is F660 v3. Don't worry if your curcuit board have more chips and ports. The picture above is an F420 v3, it doesn't have WLAN chip or USB port.
Look at the picture above, if your F660's curcuit board is the same, you can sure that it is F660 v3. Don't worry if your curcuit board have more chips and ports. The picture above is an F420 v3, it doesn't have WLAN chip or USB port.