Please help!

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http://androidforums.com – I was trying to install a new rom on my verizon s3 and somewhere i messed up! I now have a message on my phone that comes up saying "system software not authorized by verizon.....take to store". I cant even boot to recovery by holding up, home and power. Im wondering if there is a way to fix this myself, and also if i take my phone to verizon will they help me even tho my phone is rooted? Any insight or help on this would be greatly appreciated! (General)