Install hd2 tool kit if you haven't already done so, this will reinstall your hd2 drivers in case you're missing something.
Sent from my HTC_Amaze_4G using xda premium
use ansars U2M8107.xap. tap on the donotu2htc and then dev unlock / exit then use connection setup and then restart your device (soft reset - power off power on)then go to your pc and delete the relationship between the pc and phone. reset your pc, or try to uninstall reinstall your Zune and try again, and on the pairing beetween pc and phone it should skip the update. because the U2M8107 changes the firmware slightly, it changes only the name to a more updated version, so that zune thinks it is up to date!