i currently have an iphone 3g, but my friend just gave me his iphone 4. i have tmobile so clearly there is a problem. i have tried searching and searching but i can't figure out what to do because i am such a noob can someone please help me out!! my main problem is that i have firmware 4.12.01 (i don't really understand this stuff lol) the iphone 4 currently runs ios6. i have tried figuring out how to downgrade to 1.59.00 so that i can jailbreak and unlock from there but i just don't know what to do, i'm so lost! let me know if there is any other info you need. thanks in advance!