he doesn't need the dongle although it shouldn't break/be defective right away but if it is they should replace it if it doesn't charge right away. Also maybe you are using the wrong adopter when doing so like a wrong wall one. Try plugging it in a pc/laptop for a few seconds. if it still doesn't charge tell them it doesn't charge. In the mean time, you have to download the payloader from their site and boot it like other SX people have who haven't bought the pro. put the systom in rcm mode and with the said program (like example on windows its TegraRcmGUI) click inject and the system will boot the sx menu then pick cfw or FW. Once the system is on and tells you the battery life, you should charge it asap. or better yet, when in sx menu, unplug it from usb and plug it in right away then boot into the system (cfw or fw).