How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

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These are instructions on how to jailbreak your iPhone 3G on the 4.2.1 firmware using RedSn0w for Windows. The Mac version of this tutorial is here.

IMPORTANT FOR UNLOCKERS
During this process you can update your baseband to the 06.15 version. If you are on 05.14 or 05.15 or higher you will need to do this to unlock. You do not need to do this for jailbreak only. Please read the following very carefully before deciding whether to do this.

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).
4. There are reports that 06.15 may disable your GPS. The iPhone Dev-Team is currently working on a fix.

Don’t update to 06.15 if you don’t need to! Only do this if you need the unlock and you’re stuck on 05.14 or 05.15, and you’re willing to assume the above risks.

Step One
Create a folder on your desktop called Pwnage

Download RedSn0w from here and place it in the Pwnage folder. Likewise, download the latest 4.2.1 firmware from below and place it in the same folder.

4.2.1 (3G): iPhone1,2_4.2.1_8C148_Restore.ipsw

Extract the redsn0w executable from the RedSn0w zip file into the same folder.
How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

Step Two
Connect your iPhone to the computer and launch iTunes.
How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

Select your iPhone from the list of devices on the left. Now hold down Shift and click the Restore button. Restore is preferred as it won't create any wasted space on your iPhone.
How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

Navigate to the Pwnage folder on your desktop and select the 4.2.1 firmware ipsw. Click the Choose button to continue.
How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

Step Three
Once iTunes has finished updating your iPhone to the desired firmware open the Pwnage folder on your desktop and launch the redsn0w application from the redsn0w folder we extracted earlier.
How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

Step Four
Once RedSn0w opens click the Browse button
How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

Step Five
Select the 4.2.1 firmware ipsw we placed in the Pwnage folder on our desktop then click Open.
How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

Step Six
Once the firmware has been verified click the Next button to continue.
How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

Step Seven
RedSn0w will now prepare the jailbreak data
How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

Step Eight
From this window you can select the jailbreak options you would like.
How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

Verbose boot displays detailed information on boot of your device and is generally only needed by developers and advanced users.

Make sure Cydia is selected. For this tutorial we will also select Custom boot logo and Custom recovery logo.

When you click to select each custom logo option a dialog window will appear asking you to select the image. Locate the image you would like to use then press the Open button.
How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

*Remember the rules for boot logos are: RGB or Grayscale format with Alpha channel and dimension below 320x480. If you would like to use the iClarified ones they can be found here: Boot Logo, Recovery Logo

Notice that RedSn0w can Enable multitasking, Enable homescreen wallpaper, and Enable battery percentage. If you do not need multitasking we would recommend deselecting it as it makes your iPhone 3G run very slow.

If you read the warning above and you would like to update your baseband to the 06.15 iPad version for unlock then check Install iPad Baseband. Click Yes when prompted to confirm your decision.
How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

Click the Next button to continue
How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

Step Nine
Please plug your iPhone into the computer and make sure its OFF then click the Next button
How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

Step Ten
RedSn0w will now guide you through the steps to get into DFU mode. You can find more help with DFU mode here
How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

Hold down both the Home button and the Power button for 10 seconds.
How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

Release the Power button and continue holding the Home button until RedSn0w detects the device.
How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

Step Eleven
RedSn0w will now downloaded the iPad baseband if needed and your iPhone will reboot
How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

Step Twelve
RedSn0w will then begin uploading the new RAM Disk and Kernel.
How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

Step Thirteen
Once this is complete you will be notified that RedSn0w is done. Click the Finish button. When your iPhone finishes rebooting (5 minutes or so) it will be jailbroken with Cydia on the SpringBoard.
How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]


NOTES:
If you have problems with RedSn0w on Windows Vista or Windows 7. Right click the executable and set it to run as administrator in Windows XP compatibility mode.

UNLOCK:
You can now follow this tutorial if you want to unlock your device.


*As usual a big thanks to the iPhone Dev-Team for their hard work and contribution to the iPhone community.
leatherneck3112 - January 29, 2016 at 7:06pm
I followed this procedure 10 times and each time it failed. The failure presents itself after I've placed my phone in DFU mode and the software is indicating it is installing the iPod baseband software. I receive the "please wait" dialog but after a few moments RedSnow just shuts itself down without any message (error or otherwise) being displayed. I tried running in XP compatibility mode and as an administrator but it didn't work. Any suggestions on hot to get around this?
leart78 - October 13, 2016 at 5:19pm
its tethered, you must use the redsn0w used in the tutorial, not the latest one :P
krishnakanth - May 15, 2015 at 6:34pm
hi, i have jailbreaked iphone 3g 4.2.1 but the iphone is not turning on somebody can help me
Bryann - November 2, 2014 at 9:06am
How about if the lock button dont work or power button '??
Asad Rafi - May 3, 2015 at 11:48am
then you download redsnow 0.9.15.b3 then open it and click on extras then even more and then dfu ipsw then select ipsw and restore with that ipsw and iphone will enter dfu mode
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