Upgrading from 3.1.2 to 4.1.2 and jailbreaking.

[bodybreak01]

I can't change my firmware in itunes wiuthout getting stuck with a 1015 error, so that's why I downgraded to 3.1.2.

I want to jailbreak my phone, but I need to update my firmware I believe.


What are the best ways to:

a) upgrade without itunes (giving me a 1015 error)

b) jailbreak my phone. (is it possible to jailbreak 3.1.2?


Thanks in advance.

[monkeydance]

which phone?