Jailbreaking 3.0 firmware iPhone ?

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I bought an already unlocked iPhone 3G with firmware. How do I jailbreak ?
According to this video :
http://www.youtube.com/watch?v=qDDEN3zfQOg
If my phone has been unlocked using yellosn0w then I shouldnt jailbreak using redsn0w ?
But i don't know what it's been unlocked with so what do I do ?
 
Step One
Create a folder on your desktop (or wherever you’d like it to be). This will be the folder we use for our redsn0w files, etc. You can name yours anything you’d like; to keep things simple here we’re naming ours Pwnage.

Download RedSn0wfrom and place it in the Pwnage folder. Next, download the latest 3.0 firmware from below and place it in the same folder.

Extract the RedSn0w zip file to the Pwnage folder. You should now have a similar looking folder with the same contents as the one pictured below:


Step Two

Now that we’ve got everything where we want it, go ahead and launch redsnw0w.exe from the Pwnage folder that you created in step one.

Step Three Once RedSn0w opens, click the Browse button

Step Four
Select the firmware ipsw that we placed in the Pwnage folder, then click Open

Step Five
Once the firmware has been verified, click the Next button to continue.

Step Six
Make sure Cydia is selected and click the Next button.

Step Seven
Please plug your iPhone into the computer and make sure its OFF before clicking the Next button

Step Eight
redsn0w will now guide you through the steps to get into DFU mode. Don’t worry if you don’t nail this down with split-second precision; there is some room for error and if you completely mess up, redsn0w will simply take you back to this step for another try.

Hold down both the Home button and the Power button for 10 seconds.

Release the Power button and continue holding the Home button until redsn0w detects the device.

Step Nine
Your iPhone will now reboot

Step Ten
redsn0w will then begin uploading the new RAM Disk.

Step Eleven
Once this is complete, you will be notified that redsn0w is done. Click the Finish button.
When your iPhone finishes rebooting (5 minutes or so), it will be jailbroken with Cydia on the SpringBoard.
 
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