Soft Bricked my Verizon GS3...

[Red Storm]

My phone is basically stuck with an error message about unauthorized software, and it tells me to take my phone to a Verizon store. How do I get by this?

I was trying to go from an ICS ROM to completely stock Touchwiz.

 

[vshah]

you should still be able to get into download mode and use ODIN to reflash a stock image.

this seems to be a good guide, try at your own risk:
http://forum.xda-developers.com/showthread.php?t=1840030

 

[Red Storm]

That actually is the guide I was trying last night. When I try to go into download mode it shows up for one second then goes to the Verizon error message, and ODIN doesn't see my phone.

 

[Red Storm]

Success! Whew, that had me worried for a bit

A few guides I found kept saying to hold Volume UP with power and home, but I found a random forum post that said to hold Volume DOWN and that brought me to a prompt that let me continue to download mode.

Edit: Or not. I got past the error, now it's stuck on the 4G LTE screen...

Edit 2: Fixed, back to stock.