Many thank to the OP for taking the time and trouble to help us update our machines. For those of us that are not quite so computer savvy, this may answer a few of the questions asked. If you are already running version 257. you do not need to update to 260. Just load the new map and the activate. When you copy either the map or the activator to your sd card. Do not copy the "Folder" open the "Folder" and copy just the files to your card. The PDF instructions are good, but get confusing when mentioning the "Green" menu. it is not needed.
If for some reason the map update doesn't work for you. you can put your old map disc back in and load the database from it, and it works fine. I know because I had to do it, because I copied the activate "folder" instead of the files.
Sorry if this is a bit basic for some of you, but it is how I failed at the first attempt. Hope this may help some of you.