I have a BMV 712 that is not working. It hung up on install with the firmware upgrade. Subsequent firmware upgrades fail. Shunt seems to work, but 712 doesn't register or give an LCD messages. Just jibberish. Other Victron equipment did update successfully. My dealer (I am in the U.S.A.) has not gotten me a replacement unit as promised and after 3 weeks I'm getting frustrated with the warranty/replacement process I do not know if it's Victron or my Dealer who is at fault and don't care. Just want a replacement. How do I resolve this other than ordering a new one and putting in a credit card or paypal complaint?