According to your inquiry, I9300 is connected to a computer. You can do this: You download the PC suite samsung kies from Samsung official website. Download address:
/support/ useful software /Kies/JSP (select computer system version) If you have upgraded to Android 4.3 or above, you need to download the version of Kies3.
Install KIES/KIES3 software on the computer, turn off the USB debugging of the mobile phone, and connect the computer through the data cable.
Note: If your computer is an XP system and needs to upgrade SP3 version, please install Windows Media Player 10 or above, and turn off the firewall of antivirus software when connecting. (It is recommended that you use WIN7 operating system)
If you still can't connect successfully:
1. Make sure that the usb debugging function is turned off.
2. Replace the USB interface of the computer. It is recommended that the desktop use the USB port on the back of the host.
3. Try to turn off the antivirus software or firewall in the computer.
4. This may be related to the computer system compatibility program, or you can try to connect to another computer.
5. Try replacing the data cable
If the problem still exists, I suggest you take your mobile phone for repair and testing.
Welcome to Samsung service to make an appointment:
/reservation