I know this is going to sounds strange, but it worked for me. I had upgraded to 098, and had updated the DVD firmware as well. I wanted to put in the hacked firmware, but I got the "data disc" message. Try as I might, I could not get it to even recognize the cd's that I used to do the original upgrade with. (with the exception of the DVD firmware.. and this is where it gets interesting)
I reset the unit to factory defaults, still no go. So, just messing around, I inserted the DVD firmware disk. The system recognized it. Hmmm, I thought. So I decided to put in the hacked CD firmware, and low and behold it worked!
I'm not sure why inserting the DVD firmware cd had an effect, but it seemed to have. I cannot explain it, but after creating several coasters where I'd get the "data disc" error, this seemed to work. Can anyone see any apparent logic in this?