I have an iPhone 3GS on 4.2.1 with a baseband of 05.15.04.
As I understand it, if my baseband is upgraded to 06.15, I won't be able to re-load my factory defaults, or cover up my jailbreak if I need an exchange.
I don't care about unlocking, I'm using the phone on AT&T anyway.
So is there a way to jailbreak 4.2.1 on my 3GS while leaving the baseband as it is, meaning that I could still factory reset, etc, if needed? Most of the guides I've found either say they DO upgrade the baseband, or are vague as to whether or not they do.
As I understand it, if my baseband is upgraded to 06.15, I won't be able to re-load my factory defaults, or cover up my jailbreak if I need an exchange.
I don't care about unlocking, I'm using the phone on AT&T anyway.
So is there a way to jailbreak 4.2.1 on my 3GS while leaving the baseband as it is, meaning that I could still factory reset, etc, if needed? Most of the guides I've found either say they DO upgrade the baseband, or are vague as to whether or not they do.