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Help Help, bricked my phone

If you flashed an I9300 rom on an American S3, then it's likely the kernel overwrote your bootloader. Without the bootloader, it is impossible to boot into any mode. If that is the case, you're best option is to JTAG the device to reflash the bootloader onto the phone. However this is not something you can do yourself because it require very specific(and expensive) equipment and knowledge.

I recommend MobileTechVideos, they have a great track record of fixing these exact situations. http://mobiletechvideos.mybigcommerce.com/samsung-galaxy-s-iii-jtag-brick-repair/
 
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