Iphone 4 update baseband?

[litrica]

I have Iphone 4 4.2.1 and i jailbraked whit greenpoison. But i cant unlock my iphone.
My iphone is on 03.10.01 base band. How i can update baseband to be able unlock my iphone. Sorry for bad english. Tnx for anwsers.

 

[iGaz]

That baseband can't be unlocked and you can't upgrade it on an iPhone 4. You would need to downgrade it to an earlier baseband to be able to unlock it but you can't do that either...