Jessica, here is what I have about that error Error 2001 from here
The Mac OS X kernel extension "IOUSBFamily" that was bundled with late 2008 / early 2009 MacBooks, as well as the 10.5.6 update, has a bug where it fails to properly recognize an iDevice in DFU Mode. It can be resolved by updating to 10.5.7 (or later), or using a USB hub.
Little bit more of a discussion on here I hope it helps.
Of course, you also followed our guide about liquid immersion ;-) Good Luck to you....