I have a CPC 800 50th Anniversary Edition, made in 2010, but it has the newer NexStar+ hand controller. The scope's GPS was affected by the GPS week rollover. I first discovered that only about a month ago. When it linked to the GPS satellites, the date read: "02/12/00." So I asked a friend with an older CPC scope if she could update my HC for me, as I don't have a PC. She did, but when I first used the updated HC, the scope doesn't even recognize that it has a GPS receiver in it. When you power it up and start an alignment, the scope immediately reverts to asking you to input a "custom site" or a site from a list of cities. It doesn't try to link to the GPS satellites. I've gone into Utilities to "GPS on/off" and pressed enter to turn the GPS "on," but nothing happens. It still asks for you to input lat. and long., time, AM or PM, etc. Has this happened to anyone? Did my friend download the wrong HC update? I've contacted Celestron, and all they say is to go into Utilities and turn on the GPS, which, as I said, I've tried and it doesn't help. Any suggestions? Thanks!