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Jailbreak and Unlock iPhone 3G 4.2.1





You will need to download these files to your computer, you will need them to unlock your iPhone


Redsnow for Windows


Redsn0w for Mac


iPhone Firmware 4.2.1 (IPSW)



Windows Users:(If you have mozilla firefox or Chrome, use that over Internet explorer! If you download the iPhone 3GS firmware (IPSW) through Internet explorer, watch this video how to turn firmware from .zip to .ipsw, we need it as a .ipsw!)


Mac Users: Make sure you turn off "Open safe files after downloading" before you download the firmware, by going to Safari (upper left hand corner) then preferences, then uncheck the "Open safe files after downloading".



If kittyra1n helped you jailbreak and unlock your iPhone 3G, feel free to like kittyra1n on facebook, follow kittyra1n on twitter, and feel free to donate ANY amount.



If you ran into any redsn0w errors, such as getting stuck on "uploading Ramdisk", Click here.




OR use our written guide to Jailbreak and Unlock iPhone 3G 4.2.1 with Redsn0w



Jailbreak and unlock iPhone 3G 4.2.1 firmware untethered for free with redsn0w. This will work on Microsoft Windows and Mac. This is similar to greenpois0n, blackra1n, and limera1n. After the unlock you will be able to use your iPhone 3G on any carrier, such as AT&T or T-Mobile.

The jailbreak and unlock won't affect your exisiting AT&T wireless service. This jailbreak is untethered, this is a good thing. While technically Apple considers jailbreaking voiding the one year warranty, all you have to do is restore in iTunes and your iPhone will be back in warranty, this goes the same for insurance.

Step 1:

Download and save Redsn0w

Redsn0w for Windows

Redsn0w for Mac

Save Redsn0w









Download and save iPhone 3G Firmware 4.2.1 IPSW

(You should download the firmware through firefox, if you download it through IE, change the extension from .zip to .ipsw, if you download the firmware through Safari, before you start the download go to Safari in the upper left hand corner, click "Preferences" and uncheck "Open safe files after downloading")


iPhone 3G 4.2.1 IPSW Firmware

If you downloaded it through Internet Explorer, heres how to change the .zip into .ipsw








Step 2:

Once all the downloads are done, go to the folder where all the files you downloaded are located at, most likely your "downloads" folder on your computer, you can also go to this by right clicking redsn0w and click "Open containing folder"

Right click redsn0w




Step 3:

If you are on Windows Vista or Windows 7, right click redsn0w and click "Run as Administator", if you are using XP, or Mac, you do not need to do this step, just open it normally.

Right click redsn0w and run as Administator






Step 4:

IF your computer asks are you sure you want to open this file, say Yes

Yes on redsn0w






Step 5:

Once redsn0w is open, click browse, we are going to browse for the other file we downloaded, the iPhone 3G 4.2.1 firmware.

browse for iPhone 3G firmware with redsn0w






Step 6:

Find and choose the iPhone 3G 4.2.1 IPSW firmware, it should be in your downloads folder, but it could be somewhere else, if redsn0w isnt recognizing it, you need to download the ipsw again through firefox, and choose that one.

browse for iPhone 3G firmware with redsn0w again





Step 7:

Once redsn0w successfully recognizes the iPhone 3G 4.2.1 IPSW, press next

iphone 3g ipsw recognized





Step 8:

Choose "Install Cydia" and "install iPad baseband", I suggest you uncheck "enable multitasking" because it will slow down your 3G dramatically. You can leave "enable homescreen wallpaper" and "enable battery percentage" checked if you want.

install cydia and unlock iphone





Step 9:

Now make sure your iPhone is plugged in, if it is, turn it off. Before you press next, you will have to put your iPhone 3G into a special mode, a mode called DFU mode, essentially you hold the power button for 3 seconds, once you see the Apple logo come up, hold down the home button at the same time as you're holding the top button for 10 seconds, after 10 seconds, let go off the top button but keep holding the home button for 10 more seconds!Your iPhone 3G screen should now be blank, if it is blank, press next, if it isn't try DFU mode again, if you need help watch this video.


Ignore any messages from iTunes, DO NOT RESTORE IT NOW, now that your iPhone 3G is in DFU mode, press next on redsn0w, this will jailbreak and unlock your iPhone, leave it plugged in until it finishes.

Your iPhone 3G should now be jailbroken.

Step 10:

Your iPhone will now boot back up, you will notice a new icon, Cydia. Before you open Cydia on your iPhone, connect to wifi, by going to Settings, Wifi, and choose a wifi network to connect to.




Step 11:


Now open Cydia, it will load data, it could take a few minutes, and it might restart a few times, this is normal. When it asks if you are a "user" "developer" or "hacker", choose "user".

choose user

IF it asks you about upgrades, choose "complete upgrade". Any errors cydia might give you is normal. After the upgrades you might need to restart your iPhone, if does, restart it, and then open up Cydia again.

complete upgrade cydia

Step 12:

Now open Cydia again, and at the bottom right, tap "search" and search for ultrasn0w. Then tap on it, and press install at the top right, then press confirm.

search for ultrasn0w
install ultrasn0w
confirm ultrasn0w


It should say you need to reboot your iPhone now, if it doesn't turn it off then turn it back on.

Your iPhone 3G is now unlocked!


You can now insert any sim card into your iPhone 3G, if you don't get a connection right away, turn your iPhone off then turn it back on.




If we helped you unlock your iPhone, feel free to like us on facebook! And follow us on twitter.

Help us keep the site running by donating ANY amount through Paypal


If you ran into any errors, such as stuck on uploading ram disk, check this video on how to fix it, then run redsn0w again.

If you need immediate answers to your questions, or just need to contact us, ask us on our facebook page.

Or email us at kittyra1n.com@gmail.com