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Just read and thats not a great guide mate.
Did you tick ANYTHING other than PDA on Odin?
Did you extract the file only down to .tar?
Far better flashing Siyah using same method. It gives you custom recovery so u can flash roms etc and lets you over/underclock
Might be worth booting into download mode and flashing an official firmware (doesn't need root).
Then maybe try this method to root: forum.xda-developers.com/showthread.php?t=1957273
This is assuming you're on the international S3
Can you even get into download mode?
So in download mode, whats his options? Find stock firmware on sammobile website and use Odin to flash it?
Then he'l atleast have a phone again while he finds a better way to root?
So hows Cleanrom Mike?
Im usin Neatrom (very TW based) is Clean the same idea?