Default Flashing the 4.3 stock rom

Hi everybody! Recently had some problems with my root...
I rooted my sgh-i747 on 4.1.2 and upgraded to jb 4.3. Upon doing this my phone kept super su and I was able to make it work again once i updated from the app store. I later tried installing cyanogenmod 10.2.0 RC1 and had to stop part of the way through and now its partially flashed and the logo only appears when I go into recovery...
I've tried flashing CM again by it fails every time :/.
So now I'm open to fixes, but I'd rather just flash the stock jb 4.3 onto my phone and root once I have a clean version of the os.
So if anyone has a fix or could link the stock 4.3 jb rom to this thread (not the 4.3 update, I've tried that) it would be greatly appreciated.

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