No you just need to grab the NEC 2510A firmware and a DOS flasher to proceed with the firmware upgrade, read at the rpc1.org (link at first post) more info and more information!
Thanks again for your answer and sorry to bother you again, but I do not see it clear. The only files I have been able to find are Firmwares versions 1.06 and 1.07. In the text file of the version 1.07 reads that it can only be applied to version 1.06, so I guess I have to install version 1.06 before 1.07. Other thing that reads in the text file is that "-This update dont create a dual layer writing function", and that makes me think that I do not have the right files to get Dual Layer capability.
I have been looking the posts in RPC1.org but I do not find the answer I need.
Please, could yo describe the whole process in detail and links where I could find the right files.
Best regards and sorry to be such a pain in the neck ;->