ASUS BC-12B1ST b & Booksetting

My drive reports as an ASUS BC-12B1ST b 1.00 in ImgBurn. I’ve read the past few threads pertaining to this drive, but couldn’t find any mention of the “b” variant. But I’m trying to Bookset a +R media. Assuming that the drive is some LG clone, I tried that tab in IB. All I get is this popup box: “Failed!; Reason: Invalid field in CDB.” Any ideas?