Activation 1.1.2, For Windows
Step 1: To activate iPhone 1.1.2, you need an iPhone that went through the downgrade process to firmware 1.0.2 or 1.1.1.
Step 2: Open Installer and install OktoPrep (Tweaks 1.1.1 section).
Step 3: Open iTunes and click update (do not click restore!) The phone firmware to 1.1.2.
Step 4: Now install iPHUC and Java Runtime Environment (JRE) v1.6 (update 3).
Step 5: After you installed the downloaded packages, then download and install Jailbreak 1.1.2. Next, run the Windows.bat file and put a checkmark next to Install SSH and click Jailbreak. The process will take some time.
Step 6: Next to Installer, section Tweaks 1.1.2 and install iWorld. We exit, launch iWorld and select your country.
Step 7: The phone is activated.