basically i did all the process that i was soupposed to do(i followed the directions that i have found on this site)
the problem is that when i'm going to install the custom firmware itunes tells me that there is an unknown failure!
i don't understand why!i did it with 3 different computer(2 windows and 1 mac) always the same issue!

itunes is alway asking me for the upgrade to the 4.0.2
but i really don't wanna instal the new firmware!
another problem is that i tried to install another firmware like 4.0.1 or simply 4.0 and itunes shows always the same issue pop-up!

i'm going crazy!