I have a customer that were trying to upgrade to 7.1(3), however he is currently at 5.1.2.3110-1 and we need to have him at 5.1.3 before we can go to 7.1(3). I've tried to upgrade him 3 times from his 5.1.2 to 5.1(3G), 5.1(3f), and 5.1(a) only to ke...