Ok I also suffer a problem similar to this:
I used to have a 1655 and a 1650, and the 1650 burned quite poorly whereas the 1655 burned quite well
So I thought maybe 1655 had a more mature firmware? So I crossflashed the 1650 to 1655. It didn't help, so I decided to revert back to 1650 through another crossflash
That's when trouble came. I chose the 1655 by mistake (because they were both listed as 1655s at that moment). Now the drive still works, but it's not working as well as before. Around 40% of the times it'll decide that my MAXELL 002 8x discs can only be burnt at 2.4x, right from the start. Other times it'll just burn discs from the same spindle at 8x no problem
Anyone tried crossflashing 1655->1650 and then back? Did it break your drive?