so i created the ispw.. stored it on my desktop.. then i do the process to ender DUF mode, and i get to the end and it says failed. and my iphone doesnt show up on itunes it has an error that i think is 2001. so then i unplug it and do a soft reset and i plug it back into itunes and it says its in recover mode.. so i dude alt option key and restore find the ispw i built and it says error 21.. so then i just restored it to its regular stock functions.. what am i doing worng. btw. i have a kinda new macbook it is not the new one it is the one before that,bought a month ago running 10.5.6