Sony DRU-540a issues

Ok, so… I’ve got this drive, I’ve flashed to 1.0b, and now all I can burn is CDs. Any (and I do mean any, I’ve tried gobs of different stuff) DVD media gives me that nasty focus/tracking business. Of course, being the knucklehead that I am, I neglected to backup the original firmware. So, my first question is does anyone know where I can get my hands on that, perhaps?

Also, I’ve seen a couple threads about this drive being a rebadged Opto 1203. Has anyone successfully used Opto’s firmware on it?

Basically, I’m looking for anything I can try before I deal with Sony and RMAing or whatever this hoopty.

Thanks for any help. =)