In that case, you need to install the iPad baseband 6.15.00, I think I've given you the guide in my PM, follow that guide and you should be able to install the iPad baseband and use ultrasn0w to unlock the 3G.
Ultrasn0w for LOCKED iPhone 3G/3GS/4, v1.2.1 available | Supports iOS 4.3.1
Feb 21 2012, 02:35 PM
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