I read the sticky thread. It's exactly the same as the support page. Both are worthless.
STATUS CODE: 396B-0000-0080-0300-8007-045D
I followed your fail steps to attempt and fix your fail update. The result: FAIL
I've been debating calling support, but what's Takahala Kahmalah from India going to do? Nothing. Once again, FAIL.
System update 14717 is the zipped file linked on this site. Is this the proper update? Or is this the December 2011 update? I certainly hope it is. If it isn't then update your *** site and SUPPORT your users. This is, after all, Xbox Live and Microsoft. A trusted and loved name in tech.