Firmware Problems

I changed the firmware of my HL-DT-ST DVD+R 4040n from C08 to a firmware that made it possible to burn DVD+R and DVD-R Discs. After the change my burner only writes at 2.4x on +R and -R Discs. I have tryed to revert back to my old Firmware(C08 or C11), but i keep getting JWS1_DELL(4)_Down_a(T).exe has encountered a problem and needs to close.

Any ideas how I can get my firmware back to the old one?

Check the drive’s dma.

Just enable DMA for the drive.

Is it a Dell dude?