I have received XXL RTK GPS and XL RTK GPS kit. I have tried several cables with XXL RTK GPS and had the same issue with all of them. If I tweak the cable around unit powers on, shuts down or it is powered but not detectable by the computer. As the cable is not an issue the problem should exist in PCB connection. Because of shipment, delays and custom issues I didn’t wat to send it back. So I opened the unit and found out that at least 2 pins of the usb connection came out of the PCB. Unfortunately when I was trying to fix it, I messed up and spoiled the PCB. I wonder if Drotek can send me the bottom PCB only without the batteries?