Prompt [Q] Galaxy S3 Stock Firmware Bootanimation Change

Hello.
I've been looking all around (im sort-of a noob) and couldn't find a way to change boot animation on stock firmware of Boost varient of samsung galaxy s3. I really dont want to install a rom if it takes me away from stock because last time I did that I messed up my phone alot and couldnt connect to boost mobile network. Well basically I need a way to change boot animation on stock Galaxy s3.

~~NOTE~~ I HAVE ALREADY TRIED ADDING BOOTANIMATION.ZIP IN SYSTEM/MEDIA AND IN _____/LOCAL ~~NOTE~~~