Ok....

Heres the question!

I have an iphone 3G (second one i have got from o2) my first one never got signal it was running 2.0.2 so i took it back and got another one which gets full signal and 3G all the time running 2.0.1

So i want to stay with 2.0.1 as seems to be better firmware for signal IMO.

If i jail break my phone using WinOwn 2.5 does it change anything to the baseband / modem firmware / firmware of the phone if i use a 2.0.1 IPSW file?

I'm scared the jailbreak will flash my phone and give me poor reception again

Can anyone advise excatly what it changes on the iphone it must hash something in DFU mode???