This simple guide for Windows explains the steps necessary to unlock an iPhone with any firmware, which has 3.9 or 4.6 bootloader (ie all iPhones existing at the moment). This procedure is valid, as mentioned, for all firmware: from the oldest, to 1.1.4, including 1.1.2 and 1.1.3. The procedure involves updating to the latest firmware version currently available, ie 1.1.4.
Step 1: Download and install ZiPhone
To unblock it, download the Windows version of ZiPhone 3.0 (by clicking on Download at the top). Once the EXE file is downloaded, simply run it to unzip the ZiPhone folder. The file that interests us is ZiPhoneGUI.exe. There is also a version for Mac
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