I don't have a HC-3 so I can't help very much on this one but what steps did you actually take? As far as I can remember the HC's should time out, show an error message and go back to the screen that had the button that you originally pressed. If that doesn't happen and it's still in the update mode then you can try the reset button, if the HC-3 has one, or you can let it run completely flat and then recharge it and see if it comes back normal or not.
While Ring still doesn't make his software available for Mac (or Linux for that matter, just to plug that one) several have successfully run Rings software under Parallels, and possibly another method which can't remember right now.
- Tim