Date registered: Jan 2012
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You need to go to Engineering Mode
I don't know exactly how to, but to start you need to go to Engineering Mode to change settings. To do that hold down these three keys together for 3 to 10 seconds: "hang up" + "#" + "1". I haven't been able to find it but I believe it's somewhere in the HW Settings > HU Settings section. From there I'm guessing you need to change the Region within US but that's just a guess. I'm still looking for it myself.
One note about navigating through the Engineering Mode: Note that there are sometimes 2 or more pages for each section you're in. You can tell because the top will display (1/2) or (1/8) meaning you're viewing 1 of 2 or 1 of 8 pages. Make sure to check all pages to find what you're looking for. To switch pages press the "2" or "8" keys to page up or down.