The service manager at my dealer said the dvd of maps will not effect my override button, so I am off to update my maps, I will post if it works Ok and if it does not, you should be able to hear me swearing with your P/C . In case you did not hear me, I no longer have override of the motion sensor, I have not tried putting the old dvd in and re booting, I am searching the internet for a hack to the gen 4 -11 upgrade. I hope this keeps someone from up grading that wants to keep his override button on volume menu. I put the original map DVD back in and I still no longer have override. I called the service manager and he said bring it in and a tech would look at it. The tech told him the new Dvd deletes the override and you cannot get it back. He told me since he told me I would keep my override, that he knew a guy that installed the lock pick and he would pay. I said thats fair enough.