How to downgrade iphone 3gs baseband 05.16.05 to 05.16.02?

I use iclarified to jailbreak and unlock my iphone as I feel I can trust them. I have successfully jailbroken my iphone but I can't unlock it because you need a baseband of 05.16.02 or lower. How can I downgrade my baseband? I do not want to upgrade my baseband to 06.15.00.

You can't.same with most system updates.once you update it, the lower version disappears.

You can Unlock I-phone 3GS without downgrade the Phone… You can get Remote Unlock service from the site http://www.theunlockspot.com/apple-iphone-3g-s/rs10wp9/ and Unlock I-phone 3gs easily… It's simple and easy way.

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