N92 firmware

Nokia does not publish "electronic schemes" of devices (and for firmware the request is meaningless, because firmware = embedded software).

Your answer is funny. 🙄

Go to this website, you will find a lot of Nokia firmwares. :icon14: http://www.gsmhosting.com

Firmwares for me are important to understand how could I reverse them
No more. :tongue:

I think you must understand it.

I'm perfectly aware that there are illegally distributed copies of firmware files (like many other kinds of digital material; software, music, movies, etc.) on the Internet.

I'm also aware of this site's rules, which you agreed to follow when you signed up:
http://www.allaboutsymbian.com/forum/faq.php?faq=faq_rules#faq_rules

Nevertheless, ROM images (firmware files) will not help you reverse engineer the electronics (schematics) of the N92, or any other device (at least not, unless you also have the hardware at hand, too).