XDA Senior Member Net.silb has managed to get a hold of the official bricked repair guide for the Samsung Galaxy S III. It is definitely an exciting read, and it outlines how Samsung handles bricked Samsung Galaxy S III devices. It is a very involved process and requires both hardware and software expertise to fix. Therefore, it is not recommended for beginners. According to the manual, you’ll be walked through the following process:
- Brief JTAG process for GT-I9300
1) Copying JTAG(bootloader) file to external SD Card, using normal GT-I9300.
2) inserting the SD card to ‘No Power’ phone, and copy the bootloader file to the defective PBA.
3) After downloading bootloader file to the defective phone, enter the download mode with the phone, and download Full S/W.(PIT, PDA, CSC, PHONE files)
In short, you will put the bootloader on a SD card, put it in the phone, use a few hardware tricks to get it to download to the phone, and use Odin to flash the firmware. There is also a picture and reference to the elusive Samsung Anyway Jig. Additionally, it is shown that when you use this method, you’ll be flashing the bootloader over something called SDCard Mode.
If you follow the process, you’ll have a functioning Galaxy S III from a previously soft-bricked device. However, that is only about half of the significance of this document. The big prize here is seeing how the Samsung techs get it done. If you’d like more info, check out the original thread.