The problem is you cannot use anyone else's software with your unit. When you bought it you gave them your serial number which they load on a check file on the DVD. It automatically pulls up your serial number when you start the upgrade and asks you to enter in the authorization code they sent you. if you are loading someone else's software, or loading your software on someone else's unit, it will fail the check and stop the load. One of the guys at work borrowed my software to upgrade his 700 and now has an unusable unit. I am trying to find a way around this problem, or a way to load the original software back on, but have had no luck.