NEC 3550A Burner Firmware HELP

I need some help PLEASE, I bought a new NEC3550A Burner and I update the firmware to Liggy & Dee NEC ND-3550A firmware and now my burner will not burn any higher than a 3X, I tried to put back in the firmware that came with the burner but with no luck, I get this error, TARGET NEC-ND3550A IS NOT FOUND, I have my DMA primary at 5, Secondary is at 2, running a Dell 2.4, 1.5G Ram Windows XP Home, any help at all would be appreciated, Thank you.

Post the result of the Nero CD-DVD Speed burst transfer test, you need a disk with some data in the drive to run the test. It should display about 23 MB/sec.