unlocking iphone 4 4.2.1 firmware. 23 Nov 2010. Check out this article on iOS 4.2.1 Jailbreak and Unlock possibilities. iOS 4.2.1 Download IPSW. Download iOS 4.2.1 IPSW for iPhone 4. I got mine for approximately 2 and it unlocked my iPhone on the Apple servers. way to unlock an iPhone (from carrier and Apple) 3GS running 4.2.1 firmware Jailbreak-Unlock iPhone 3G, 3GS firmware 4.2.1 Using RedSn0w. download the latest 4.2.1 firmware from below and place it in the same folder. iPhone 4. Unlock. 29 Dec 2014. Jailbreak Iphone 6, 5s, Iphone 4 Iphone 4s. We also have. and Ipad. All free IOS firmware jailbreaks. by Apple. Last firmware was 4.2.1. Nov 30, 2010 · Just as we had expected, the iPhone dev team has released the Ultrasn0w 1.2 tool to unlock the latest iOS 4.2.1 firmware on iPhone 3GS and 3G … 5 Feb 2011. As usual, this is not something that is difficult, provided you know and master how to do it. Although there are some step by step the same, but .