Well it’s still not available for Windows users officially, but what you can do is follow these instructions from Kinetic-X and NightCrow then load the pre-built custom firmware image. You will have to download a custom image. Find the appropriate “custom image” off the “custom image” section here.
Step 1: Use WinPWN 2.0.0.3 or later To PWN your 2.0 iPhone. If you need any help on this step, follow my winpwn 2.0 guide here. If you need to unlock, do so in this step. The update to 2.0.1 will not update your baseband.
Step 2: Grab a pre-created IPSW Made with PWNAGE 2.0.2 Mac. If you dont have one made you can grab one here off my firmware links in custom section.
Step 3:Put your phone into recovery or DFU mode. Note that some users report DFU works best while others are reporting normal recovery mode works best. If you have an error, try swapping modes and toggle between these two types of recovery until one works.
Step 4: In iTunes Shif+Click the Restore button and find your custom IPSW Firmware file.
Step 5: Wait for it to complete! ENJOY!