rooted galaxy sgh-t989, how to return to STOCK OS? Kies does not recognize my phone

[Steve Adams]

I have rooted and loaded a non working OS into my s2x. I broke my screen in my daily driver and need my s2 for backup until the new screen arrives. I downloaded kies, and the phone does not be recognised. Any ideas how to return this phone to stock touchwiz from Samsung so its reliable.

thanks!