I updated my Nook with the intention of manual nootering, and then restoring my backups with Titanium backup. The problem is that Titanium backup won't restore without having the unknown sources option checked. I have covered every settings option that I know of-both in the stock settings panel, as well as in the nooktools settings. I'm either the most dense person on the planet, or it's not here. Any clues, ideas, or comments?