Uninstall a Service Pack

Uninstall a Service Pack

I have installed build 9035 and am experiencing some issues with the build.  I'd like to roll-back to the previous version we had installed, build 9033.  However when I run the UpdateManager, the "Uninstall" button is never active (i.e., it's "dimmed", and doesn't do anything when clicked), regardless of what Service Pack I select.

Is there an alternative method to perform the roll-back?

Thanks.

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