-Never Plug dongle in pc before installing drivers.
-Never flash S300 with S300M flash, or S300M with S300 flash.
-Never flash xxx0 or xxx5 with xxx8 flash, for example, dont flash N620 with N628 flash or N628 with N620 flash.
-Never flash S105 with S100 flash, and S100 with S105 flash.
-Never do any change in smart card update file, your dongle will be damaged for ever.
-Never run UST pro when "SE Fighter" dongle is connected to USB port,and never run "SE Fighter" when UST Pro dongle is connected to USB port.