Help Please - Bricked sprint gs3

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http://forum.xda-developers.com – hey guys hope someone can help. i tried to return my gs3 to stock after rooting it and putting a rom on it, so i used odin and i downloaded the stock tar file from the stock rom thread, and all seemed to go alright but when it rebooted in got stuck on the samsung screen. it shows the sprint bootup thing and galaxy s3 but then gets stuck on samsung screen. i can access download mode and i can install a custom recovery using odin but when i try to just flash a regular custom rom using custom recovery it does the same thing, it boots but gets stuck on samsung screen. hope someone can help, tha (HowTos)