Iphone 3gs jailbreaking for tmobile?

Ok i have a jailbroken 3gs ios 6.1 baseband 05.16.08 and i trying to get it working for tmobile, i already have ultrasnow

need help step by step

Use http://evasi0n.com/ They take you through the steps. Download it first.

Download evasion jailbreak onto a USB drive, then plug in your ipod. Run evasion and it will download to your ipod and run. Your iphone has just been jailbroken

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