My M3i Zero firmware update doesn't work. I downloaded the latest firmware and followed the instructions, plugged the USB cable into the cart alog with the memcard, then plugged into PC usb socket. No lights came on on the Msi Zero to show any activity. I tried a few more times but no luck! I don't know if the socket in the M3i Zero is damaged or the tiny USB cable is damaged. Any ideas, or should I just get myself a replacement M3i Zero or USB cable?