Recently, we have mentioned & provided you evidence that blacksn0w is ported to iOS4 Beta. The man behind this is the same person who created the blacksn0w for 3.1.3 baseband 05.11.07 & iPhone3GS_iOS4GM_Bungle to help you Jailbreak iPhone 3GS. The original BlackSn0w was created by GeoHot for iDevice running 3.1.2 baseband 05.11.07. Now, msftguy have gone a step up and ported blacksn0w to iPhone 3GS running iOS4 GM with baseband 05.11.07.
This has been tested and its working. But, source mentioned that its working and its a bit buggy. Each time you reboot, you will have to reapply the patch files. So, try this only if you are comfortable doing it. Remember, a unlock tool will be released soon (End of June or Early July)

Required :
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Warning: Please do it on your own risk. We will not be responsible for any damage or breakage of your iPhone.
Remember, a unlock is just a month away.

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Step 1: Download the blacksn0w4GM
Step 2: Download NetaTalk & Open SSH on your iPhone via Cydia Store (Just search for it) / Download Cyberduck on your Mac / Download WinSCP on your Windows – In this tutorial I am using NetaTalk. If you use CyberDuck or WinSCP the steps will be the same from Step 6
Step 3: Once NetaTalk is installed, reboot your iPhone & relaunch your Finder.
Step 4: In your finder, you will notice your iPhone in under Shared Devices on your left hand side.
Step 5: Select it & click on Connect on the right corner of the Windows.
Step 6: Here enter the user name & password (By default the user name is root & password is apline)
Step 7: Once get accessed, navigate to the following folder (In your iPhoen)
root/System/Library/LaunchDaemons/
Step 8: Look for the file name com.apple.CommCenter.plist and rename it as com.apple.CommCenter.plist.back and leave it open
Step 9: Now, extract the Downloaded blacksn0w4GM
Step 10: From blacksn0w4GM/bin move the com.apple.CommCenter.plist to the navigated folder that we have left it open at Step 8
Step 11: Now, Navigate to the following folder (in your iPhone) and leave it Open
/root/usr/lib
Step 12: Now, go back to the downloaded blacksn0w4GM folder and move the blacksn0w.dylib to the folder that we have left it Open at Step 11

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    Update : If for some reason the above step didn’t work for you. Then follow the steps provided by Kev Meredith.
    Step 1: Follow the same steps as above till Step 6
    Step 2: On the iPhone leave the com.apple.Commcenter.plist (Dont move it anywhere. Just leave it where it is)
    Step 3: Now, Copy both files from Blacksnow4GM/bin into /bin on the iPhone
    Step 4: Now, Navigate to the following folder (in your iPhone) and leave it Open
    /root/usr/lib
    Step 5: Now, go back to the downloaded blacksn0w4GM folder and move the blacksn0w.dylib to the folder that we have left it Open at Step 4
    Step 6: SSH into the iPhone using Terminal(for example if your WiFi IP address on your iPhone is 10.0.1.3. Then type the following)
    ssh root@10.0.1.3  and hit enter
    Step 7: You will be asked to enter password. By default your password will be “alpine”
    Step 8: Now, you need to type the following and hit enter
    /bin/blacksnow.sh
    Note: You would need to run this script, if the iPhone is rebooted. (You would need to follow from Step 6 to Step 8)

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