Sprint Firmware Galaxy S3 -

: If the bootloader is completely destroyed, specialized JTAG unbricking services are the final resort for physical hardware repair.

: Be aware that early OTA (over-the-air) updates specifically removed the "Universal Search" feature from the Google search bar due to legal disputes, restricting it to web-only results. Helpful "Paper" & Guides Sprint Firmware Galaxy S3

: For users on the final 4.3 firmware, the Saferoot method on XDA is often cited as the best way to gain control without tripping security flags like Knox. : If the bootloader is completely destroyed, specialized

While physical manuals are rare now, the following community resources act as the definitive "papers" for this device: Sprint Firmware Galaxy S3