I have an iPhone 3G with baseband 2.30.03 and bootloader 5.9, version 2.2.1, i get no service / no signal after jailbreaking it , can i upgrade to 3.0 to unlock with ultrasnow? :spinme ; if i don't like the 3.0 version can i donwgrade to 2.2.1?
Any answer will be appreciated.:D
sorry for my bad english...:P