When entering the serial numbers it is easy to accidentally add or subtract a digit, or misread part of the number on the label, or--in the case of G5--enter the wrong character(s) for the middle section of the InterLink serial.
Please keep your serial numbers private and avoid posting them in any of the public forums. But if you double-check all the values and still can't get past that step, send me the numbers via private message and I'll see if I can help you.