i have a modded x360 and a friend of mine did an update playing a new game.I want to delete this update and return to some previus firmware.Is there a way to do this?i dont know what kind of mod it has,only it has been since 2005 or 2006.Sorry for my english,i would appreciate any help,thank you

That's not possible.

You are going to need to re-flash your dvd drive. Either do some research, or find a modder in your area to do it.

Jungleflasher.net is a good place to start your research, or look at some of the stickies in the noob board here.

Dude, I know you put years and such but how about some real information on your console.

First: Console type or year?
Second: What game performed the update, how NEW are we talking?
Third: What Dash Version is your console now?
Fourth: You play online or just chillin with games for fun?

all of those answers would actually help to point to an answer, although if it was one of the brand new games (anything during/after GOW3), you're pretty much out of luck...

Unless you want to RGH it, in which case, you should be fine...