NEC 3500AG firmware

Hi

I recently upgraded my firmware on my NEC-3500AG to 2.1A NEC original. Since then i have not been able to burn faster then 4x using data dvd_iso burn. Before this i could burn at 8x.

I am currently using TDK DVD+R and DVD-R 1-16X,Sinc e the firmware upgrade Nero detects the disc at a maximum burn of 12x with NEC 2.1A, prior nec firmware only detected it at a speed of 4x.

Could someone suggest a firmware update which will bring back my original speeds and detect the proper speed of the dvd blank if possible.

Help appreciated