NEC and Optiarc hardware?

Hi all,

I have Sony Optiarc AD-5260S and I have question for You.
Can I replace orginal firmware the Optiarc by fitmware from NEC ? NEC and Optiarc have the same hardware or not ?

For what sense and which firmware??

I was looking for the firmware with the possibility of change booktype. I have not found the Sony firmware, so I wanted to match the firmware from the NEC . But ok, I’ve found unofficial firmware to Optiarc on