[Q] Upgrading bootloader beyond I747UCUfNJ1 topic

I'm interested in putting cyanogenmod on my galaxy S3, and I've hit a snag with the boot loader version. It looks as if the ROM won't install because I'm using bootloader version I747UCUfNJ1. I've tried using CWM to install a couple of other bootloader versions, but they've all said they cannot upgrade from my current version.

My question is, does anyone have a list of bootloader version numbers? I've read a number of places that I can't go backwards, but I don't know which version I could use to go forwards.

Thanks!