I need Stock Rom for Samsung Galaxy SIII I9300

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http://forum.xda-developers.com – Hi, I am having some problems with my device and I need to Install the stock rom but I cant find the rom in separate files (phone, CSC, bootloader, rom) My device is a Samsung Galaxy SIII I9300 16 GB AT&T Some can bring me some advice I thnik I brick my phone I cant boot the phone and I cant enter to the recovery mode only I can access to download mode and the phone got stucked in the samsung logo screen What can I do (HowTos)