Can you get into download mode? Have your phone turned off then hold the volume up and down and plug in the usb connected to your computer... Should show a yellow triangle with an android digging. This is what you should put your phone into for odin in the first place. Just read the odin back to stock threads and follow directions. If your phone is still turning on you should be fine.
Edit: I'm slightly drunk right now, so if this doesn't make sense to you, respond and I will help you in the morning. Btw, thanks for posting in an appropriate section.
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