Originally Posted by Johnnysauur
You wouldn't happen to have a dl link for official would you?
Start up Kies (no cellphone connected), then go to Tools / Firmware Upgrade
It will ask you for the model number, so put that in.
Then it will ask you for either the serial number or MEID, so put that in, too.
Then it should download a big-ass android package (around 1.5 gigabytes).
After the package is decrypted, copy it from the temp directory to some safe place on your local hard drive.
Use Odin in Download Mode to install this package.
The package should end with .tar.md5
Sprint Galaxy S3 using Android 4.3 (Knoxless Bootloader)