1. Purchase a USB Jig Dongle For Samsung Galaxy S III S3 GT-I9300 Download Mode unbrick
2.This USB jig can only bring your phones into Download Mode. It CANNOT reset your phone binary counter and remove yellow triangle..
1. Turn off your phone and pull out the battery for about 10-15 seconds.
2. Just put the battery back and don’t turn it on.
3. Plug the USB Jig into the micro USB port on the phone.
4. After about 2-3 seconds, you can see the yellow download mode logo on the screen.
5. Unplug the USB Jig.
6. Connect your phone with USB cable to computer and then flash your phone via the program “odin"
It does not work with latest European Version 2.34, you have to return your device to old version to use.