As you may already know, Apple has quietly released a bug-fix version of firmware – v2.0.1. I have received a number of queries how we can upgrade and unlock this new version of firmware.
For Windows user, WinPwn v220.127.116.11 was released earlier to tackle Apple’s new firmware 2.0.1 (also, it should work with firmware 1.4 & 2.0). You can follow the procedures in “Upgrade & unlock iPhone from 1.1.4 to 2.0 using WinPwn” but using WinPwn 18.104.22.168. Just note that if you have installed WinPwn 22.214.171.124 earlier, please uninstall it before installing the new version.
Update: You can now upgrade and jailbreak iPhone firmware 2.1. Check out the complete guide here and upgrade your iPhone to the latest firmware version.