It's possible that something went wrong with your firmware flash. The Pioneer 111D does in fact support setting the booktype to DVD-ROM on D/L DVD+R discs right out of the box. I have the 111D with stock V1.23 firmware and can confirm for a fact that it does this. As for checking the booktype, all you need to do is pop in one of those burned discs and select the media ID icon. It will display the full info including the booktype. The feature that you are trying to use is worthless on the Pioneer as it is designed for drives that require you to manually set the booktype to DVD-ROM, hence the error message. I have made the same mistake on my Pioneer 109 and 111D. The feature just isn't up to speed on how to deal with a drive that does things automatically. So once again use the media ID feature and put one of your burned discs in.