I'm having the same problem, only the phone is new. The update hangs with a white box with an orange arrow coming out of it - with the yellow progress bar about 1/4 of the way filled.
I tried going to DI01 and DL09, but I am having no luck. Any other ideas? I bought the phone NIB from someone who got it as part of a "buy one get one free" deal, so I'm not sure what tech support will do for me.
What are my options? I want to root the phone and flash a custom rom anyways....I'm still kind of new to this android thing. Is the lack of this update going to matter if I flash CM7 or some other rom?