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iPhone 3G with BB 06.15.00 Fails to Boot After Restoring to iOS 4.2.1

I have managed to jailbreak my iPhone 3G on iOS 4.2.1 using Redsn0w RC18 on Windows 7. I got iPad baseband and Cydia running on my device. However, after restarting, the device failed to boot and now I am stuck at recovery mode screen with iTunes logo and USB symbol. I tried to put my iPhone in DFU mode then selected to restore settings but ended up in iTunes error. Please help. Thanks.

Asked by: Darius from Breaux Bridge, Louisiana

Hello Darius, one of the downsides of iPad baseband – aside from losing the GPS functionality of the device - is that you will not be able to restore your iPhone to the stock firmware. Anyway, you can easily fix this error by restoring your iPhone by restoring your device to custom and pre-jailbroken iOS 4.2.1 firmware which was created using Sn0wbreeze (for Windows users) or with PwnageTool (for Mac OS X users). If you have no idea on how to do it, then you can follow the step-by-step guide posted below:

Step 1: Download Sn0wbreeze 2.2.1 for Windows from here.

Step 2: You will also need to download the stock iOS 4.2.1.

Step 3: Launch Sn0wbreeze, close the credits, and then Browse for the downloaded stock 4.2.1 IPSW.

Step 4: Once browsed, Select Simple Mode.

Step 5: Let Sn0wbreeze create a custom 4.2.1 IPSW.

Step 6: The new custom IPSW will be placed on the desktop once done.

Step 7: Follow the on-screen instruction to put your iPhone in Pwned DFU mode.

Step 8: Once in PWNED DFU, iTunes will automatically detect your iPhone in recovery mode.

Step 9: Hold the Shift button on your keyboard and then click on the Restore button in iTunes.

Step 10: Browse for the custom IPSW on your desktop.

Step 11: Now, all you have to do is wait till iTunes completely restore your iPhone to iOS 4.2.1.

Now, to unlock your iPhone, just simply follow this guide on how to unlock using Ultrasn0w 1.2.3.
Jailbreak iPhone 3G on iOS 4.2.1

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