I have an AD-5540A installed in a Dell Latitude C-610. I bought this CD/DVD writer recently, and it came in with firmware version "2.NO". I want to make sure that I am running the most recent Dell firmware on this old writer. I am able to download many of the .7z files on CDfreaks, but I am not able to open what comes thru for the Dell "103cc" version I actually want. I of course have the 7-Zip extraction software, and it work fine for several other versions that I have downloaded. I have noticed that the size of the files that are going to extract correctly are around 500kb, and the ones that are not going to extract correctly are around 60kb in downloaded size, although they are reported as around the 500kb size on the LiggyDee site. Any help would be appreciated.