[1.1.3] and ALL - Ziphone and modem firmware and baseband

I've got 04.02.13_G from US bought at the end of December. I would like to upgrade to 1.1.4.

What should I do, am I right?

1. I have to restore my phone to 1.1.4 using imageiPhone1,1_1.1.4_4A102_Restore.ipsw

2.Then run the newest Ziphone?

What about basebend and firmware version? I wouldn't like to be an idiot who will upgrade them without my knowlege, please help. What modem firmware and baseband I will have?

3. I have upgraded my friend's 1.1.1 IPhone and I noticed the modem firmware version is newer then mine but it was older before upgrade! Why is that? Is it Ziphone that upgrades it? If so how can it decide it? What good things can I have with newer firmware than mine?