First you have to update the baseband to iPad 06.15 and jailbreak the iPhone with Redsn0w. After the device is jailbroken,you can use Ultrasn0w from Cydia to unlock the device.
Warning: Read the instructions carefully before start the procedure.
1. There is no way to come back down from 06.15, and there’s no hiding the baseband version from Apple. You’ll be voiding your warranty in a very obvious way.
2. If some future baseband comes out with a critical fix, you won’t be able to update to it if it remains down in the 05.xx sequence (then again, you wouldn’t update to it if you wanted to keep your unlock anyway).
3. Starting with FW 4.2.1 if you have 06.15 on your iPhone you won’t ever be able to restore to stock firmware (it will fail). You’ll need to only restore to custom IPSWs (then again, if you’re unlocker you should already be doing that).
The steps are given below.
Step 1: Download iOS 4.2.1 for your idevice.
Step 2: Download iTunes 10.1 and install it on your PC.
Step 3: Back up all the contents on your phone before you start the actual jailbreak process.
Step 4: Save the SHSH blobs if you are still on iOS 4.1 or below version.
Step 5: Update/restore your device to iOS 4.2.1 via iTunes.
Step 6: Download Redsnow 0.9.6 beta 4 and run it.
Step 7: When asked for iOS firmware, point the redsn0w to iOS 4.2.1 downloaded in first step.
Step 8: Click on next and select “Install Cydia” and “Install iPad Baseband” options. Optionally you can also select any other option available for your idevice.
Step 9: At this step make sure that your phone is switched off and plugged into the computer. Follow the onscreen instructions to put the idevice into DFU mode.
Step 10: Let Redsn0w do its work. Once completed your phone will restart and you will find it jailbroken on iOS 4.2.1.
Now if you have iPhone 3GS New bootrom you will have to connect it with Resnow and select the “Just boot tethered right now” option to get the jailbreaked state on every boot.
How to Unlock with Ultrasn0w 1.2:
After your device is jailbroken using the above mentioned procedure, open the Cydia App and search for Ultrasn0w. Install it and reboot your device. Your device is now unlocked.
Disclaimer: This guide is for testing & educational purposes only.Use it at your own risk.I’m not responsible for any loss of important data or malfunctioning of your iPhone.
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