After the preview of iPhone OS 3.0/ Phone firmware 3.0 features in the MAC world expo in march 17 ,there was some doubts spreading about the unlocked /jailbreaked iPhones ,if they could update to the latest version or not .
Now iPhone Dev team confirmed that jailbreak /unlock is possible in iPhone firmware 3.0 . And they were able to unlock iphone firmware 3.0 beta available at iPhone developer website .
Dev center team advices yellowsnow users to not use iPhone firmware update 3.0 beta . Instead of that they will have to wait for another couple of days for the release of a custom IPSW using PwnageTool . You need to a developer to run iPhone OS 3.0 .Many people who updated there software to firmware 3.0 were reported with errors and loss of activation.So be careful to Unlock your iPhone with iPhone OS /firmware 3.0. If you have already updated to firmware version 3.0 and if you need to downgrade your iPhone back to 2.2.1 , follow this tutorial .
Update : iPhone dev-team renamed yellowsnow to ultrasn0w for iPhone 3G with iPhone OS 3.0 . Check out how to unlock iPhone OS 3.0 with Ultrasn0w.
Tags: Firmware updates, iPhone, unlock iphone