I was in need of a phone a while ago, and my friend gave me his old iphone to use. It was unlocked and jailbroken by him and i am currently not in contact with him for now. So I have to learn about the phone myself. Anyways. It's current version is 4.1 (8B117) with a baseband of 6.15.00 It works fine with this build but some of the apps that i want to download require version 4.3 or higher. So, Now I want to know how I can upgrade to ios 6, because i tried going to itunes and clicking update but after a long black screen, it just gives me error 21, 1602, and 3194. ( these are different times i've done it, and yes i've tried googling these problems, and they don't work, i've tried many times to update but I simply cant. ) Is there a way for me to get past this problem? Or am i stuck on 4.1 forever?