How to update Iphone 3G 3.1.2 to 4.2.1 keeping baseband?

[user232144]

Hi everyone, I have an 8GB iphone 3G firmware I am currently using firmware 3.1.2 (7D11) with 05.11.07 baseband, but since I want to restore my iphone because I want to leave it as nothing new is I'm planning to upgrade to version 4.2.1 the last one available from Apple I think, the problem is that I want to know if I can maintain my current baseband (05.11.07) or what should I do because I need my iphone unlockable so it can be used with any operator.

I searched the web but can not find any tutorial or anyone who can answer how to get what I want, I also want to jailbreak my device and I think there is a program that you install and it both updates it makes the jailbreak, I really need your help if you could be so kind as I dont want to have problems and I also dont want to leave my phone unusable.

Thank you very much

[Unregistered]

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