Issues with Chainfire3D

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http://forum.xda-developers.com – Recently i just rooted my I9300 and i wanted to install Chainfire. I was on stock recovery so i could not have done any backup sadly. I installed chainfire3d and it made the phone boot(normal). But then it made me stuck on the BOOT screen that says Samsung GALAXY SIII GT-I9300 with a little red "!" or "exclamation mark" Do i have to flash stock and wipe? or can i just flash stock and everything will be back? (Sorry I'm new to Galaxy S3 rooting and knowledge) What i remember from my memory: Stock 4.1.2 New Zealand 2Degrees ROM with Stock kernel, nothing modded. Just root (HowTos)