i updated to the newest activesync, it did work via th bluetooth update and sync, so i don't think it is the activesync. i remember having this problem about 6 months ago, i ended up going around it with the blue tooth syncing, but i dont think you can update the phone via bluetooth.
is there a usb driver got the 820, made the one i have is corrupted?

it doesn't reconize the phone as a usb device