I did the 10.2 upgrade a few weeks ago. The instructions provided with the upgrade are perfect except... During the entire install process, the instructions are very specific about maintaining power and NOT removing the USB drive. But on Pg 10/step 7, the install is complete, and there is no indication that it is ok to remove the USB drive. Small point, but when you're talking about a $1200 brick fee if the USB drive is removed at the wrong time, it would be nice to know that it's ok to remove the USB drive on step 7.