im trying to update my ipod to ISO4 or whatever its called. but every time i try it tells me i need to back up my ipod to my computer. however. my computer is a peice of crap and every time i try to back it up. it says it cant authorize it. so there is no way for me to back it up to my computer. so im attempting to manually update it rather use itunes to do it. im downloading the update and ill use itunes to put it on the ipod using this method. will this delete all my music and movies and apps and stuff? and if so, is there any way to get them back? im sick and tired of stuff not working because "your device doesnt have iso4"