Kernel Panic after changing system to MacPro5,1

I changed my system from MacPro3,1 to MacPro5,1 in smos.plist (or whatever you call it. Sorry on my iPad) and after reboot I'm getting a kernel panic.

Here is a pic I took of the kernel panic:


I really need to use my Hackintosh so I need to fix this ASAP.

Thanks for the help

EDIT: Basically what I did is I opened smbios.plist in TextEdit and changed "MacPro3,1" to "MacPro5,1" and rebooted. Guess I screwed up. Any way to revert this change?