[Q] Phone Stuck on 2.3.4

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I just set my phone back to 2.3.4 to remove root. But I can't update it back to 2.3.6 again. It came with 2.3.6 on it.

My "About Phone" menu:

Model number: SAMSUNG-SGH-I777
Android version: 2.3.4
Baseband version: I777UCKH7
Kernel Version: 2.6.35.7
Build number: GINGERBREAD.UCKH7

I can't find an update to manually download online that doesn't have root. I also tried using Kies on OS X to check for updates but it says that my version is the current version. I also checked for updates on the phone, but I can't check for another 8 hours. Could that be effecting Kies?

So my question is: How do I get my phone back to 2.3.6?