I would greatly appreciate it if someone could direct me on unlocking my iphone 3GS new bootrom. Preferably unthethered. Ive looked all over the internet with no luck.

My iPhone is currently jailbroken with iOS6.1 but i need unlocked.

I've tried upgrading to the iPad baseband with no luck, I think its got to do with mine being a new bootrom.

I would appreciate if someone could show me steps on unlocking the phone.