So after extracting the contents of SD1 on my desktop (and not on c:\update) and copying the contents to the SD card, I was able to get one of my Z110BT units to upgrade. On my other Z110BT, (which had also failed at 20%) I went into service mode and selected the "Clear User Info" portion. Now when I boot the unit, I get a "An error occurred when updating" message. It gives me the option to click "Retry" but it just returns me to the error message as soon as I click it. Is there a way of starting the process over again?