Originally Posted by
estasnyc
A word of warning though: you will need to unlock the boot loader on your phone which will void the warranty. Installing the wrong firmware may brick your phone. "Brick" as in making your phone as useful as one.
Are any of the S3 phones under warranty?
I'm using a S4, and they're a couple of years old now, running Android 4.4.2 (which should run the OP's software).