My sister gave me a back up disc of the 60M and I tried to install it on my D1, but it wont read the disc. The problem is that it did the updates on it so now it wont even read my original disc... I thought the problem may be that I have a bypass on my park break and have a switch to control it, but flipping the switch didnt help. I was able to get the unit to read the disc once, but when I turned the car off, it wouldn't work again!

Please help!

I guess no one is going to respond to your question. Have you tried your brothers original discs? If it works then, tell him to remake another copy using DVD-R.