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Incidentally, I assume you're talking about the Kenwood KNA-DV4100?
Also, I assume this unit has come into your hands through legitimate sources. It is NOT an accusation when I mention that electronic equipment absent of an operator manual CAN have dubious origins. Again, this is NOT an accusation. Rather, it's always good to know where such a unit came from. When an owner's manual is missing, it raises a flag - unless, of course, you know and trust the person selling it to you.
At any rate, you can simply download a manual at Kenwood's website, below. Simply copy-and-paste into your internet browser's address bar:
I have seen this before it is hard to put into words what cause the trouble you are haveing, you done the right thing by ordering the update wait for that to come then go through the install process. The processor chip inside is what doing it the update might help and it might not GPS units can not handle any kind of power spike no matter how small its that or the single from a satellite could have done it that happens alot when the rays from a sun spot don't get filltered out it can mess up the satellite single and send crazy info down to the unit which messes up the unit processor. Some units has a small battery inside if yours has one take it out before you do the update just for an hour then put it back in give it two min, and start your update if you don't have a battery plug it in turn it on then unplug with power butten still on give it an hour then start your update good luck some times the update works and some times it don't.