Sony 510A not burning at 4x.....Help!

I just picked up a Sony 510A DVD burner and I am already not happy with the drive. I went to burn a disc using 4x rated Fuji media with Nero. It would only burn at 2.4x!!! The drive came with the latest firmware 1.0d. What is the deal? I did not buy a 4x burner so it would burn at 2.4x. any help would be appreciated. Thanks.:a

Try flashing down to v1.0c firmware, seems 1.0d is too picky…