Few days before, Apple released its long-awaited iOS 4.2.1 update for the iPhone, iPad and iPod Touch. For Apple iPad, it is the first major update after its launch. After this update, iPad users can now take advantage of features like multitasking, threaded messaging, app folders and much more.
iOS 4.2.1 also comes with new features like AirPaint and AirPlay for all iOS devices. AirPaint allows you to take prints from the mobile while AirPlay for streaming between mobile and Apple TV or other AirPlay-enabled hardware. This new features surely be useful and makes iOS devices more powerful than ever before.
However, for iOS devices Jailbreakers, the only thing they need to worry about is whether they able to jailbreak the new iOS update? And the answer is YES, you can jailbreak the latest iOS 4.2.1 update on iPhone, iPad and iPod Touch.
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iPhone Dev Team released Redsnow 0.9.6b4 that can be used to jailbreak iOS 4.2.1. While iOS 4.2.1 is tethered for devices such as iPhone 3GS (new bootroom), iPhone4, iPad, iPod touch 2G (MC model), iPod touch 3G and the iPod touch 4G whereas iPhone 3GS (old bootroom), iPhone 3G and iPod touch 2G (Non-MC Model) can be jailbroken untethered.
Guide to Jailbreak iOS 4.2.1 on iPhone, iPad and iPod Touch using Redsn0w 0.9.6b4 :
1) Download iOS 4.2.1 IPSW for iOS devices. You will find all download links at the bottom.
2) Update your iDevice to iOS 4.2.1 via iTunes 10.1. Select your iPhone in iTunes, browse and select the latest FW iOS 4.2.1 IPSW.
3) Download Redsnow 0.9.6b4 and browse it to iOS 4.2.1 you downloaded in the first step.
4) Redsnow will now prepare the jailbreak data. Now, select “Install cydia” and click “Next” as you see in the image below.
5) In this step, please make sure your device is both OFF and Plugged in to the computer. Click “Next”, a prompt will appear where you have to put your device in DFU mode by holding “Power” and “Home” button for nearly 10 seconds. Now, release the “Power” button while holding the “Home” button until you see a process start for installation.
6) Click on Finish after the installation process ends, you device will automatically restarts and now you will use all the features on your jailbroken latest iOS 4.2.1 device.
7) This step is only for iPhone 4, iPhone 3GS (New Bootrom), iPod touch 4G, 3G, 2G, and iPad. From here onwards, whenever you want to do anything related to jailbreak, on every reboot you must run your device in the “jailbroken state” by using “Just boot tethered right now” option available in Redsn0w.
That’s it, you have jailbroken almost any iPhone device working on latest iOS 4.2.1 update.
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Direct Link to Download
Downloads needed for Ist step :
iOS 4.2.1 IPSW for iPod Touch 4G
iOS 4.2.1 IPSW for iPod Touch 3G
iOS 4.2.1 IPSW for iPod Touch 2G
Download needed for IInd step :
Download needed for IIIrd step :
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Nice Sharing, Yogesh
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Redsnow worked for jailbreaking my 4.1 iphone but what about carrier unlock?
sounds good and a complete tutorial too…
i will surely try it…..
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Does Jailbreaking iPhone remove it from Warranty?
I really want to know details about this. Thanks in advance…
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As far I’ve look everywhere and I found that the first Ipods you had to open them up to jailbreak them there voiding your warranty but I read practical everywhere that when you jailbreak it if your Ipod ends up so messed up that you can’t access it that such as you drop it and the hard drive goes out then Apple can absolutely not tell if it was jailbroken or not and if you can’t get it to work try updating it first it could always be just a software issue which happens alot but such a simple issue to fix.
yes it totally removes thr warranty #
Thanx 4 ur post.. Very Help..
Hi, cydia is now on my phone! but I cant’t open it! can someone pls help!
for my phone, the same problem happened. open redsnow again and this time instead of choosing download cydia, you choose the third choice. Then, it should work.
You have to restore ur iDevic and try again thats what i did and it works
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restart thru redsnow or reboot something like that and that will solve the cydia problem
hi, thanks to u i managed to jailbreak my phone using ur method and all the APP in my ipod touch still goes smoothly EXCEPT i got to reboot it every time the power turn off!! I am so worried that constant rebooting will spoil my ipod touch. is there any way to solve this?
can u undo the jailbreak if something goes wrong??
redsnow will now open. it says its invalid please help me
redsnow will not open. it says its invalid please help me
Mine says that too Jacob.
I thought it was gonna work 
now how do i put the games onto my jailbroken ipod??
Hi I want to jailbreak iphone 3G 4.2.1 using redsnow, I am stuck at the first bit, when I launch redsnow and browse to the 4.2.1 ipsw donwload there is no ipsw file within the download, there is some files, along with firmware folder which has dfu and all_flash folder but nowhere in the directory is there a ipsw file, how do i create this?
What you gta do, is simple, just rename the file and insted of “.zip.” repleace it to “.ipsw” the icon will change and will allow you to carry on.
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When I tried it said that it doesn’t support 2 mc.
ay wht happens if u download dfu pwnd??????
hey guys is the second stage of rebooting really take long?
can i turn my device on if rebooting? ineed answer!
i got to the part after step 7, where the software is being installed onto the device and it basically stpped/froze when it looked full (apparently it isn’t finished putting it on) it says that it is “exploiting with limera1n” and the finish button is still unselectable. I’ve been waiting for an hour and nothing has changed….what do i do???
me too, and im still waiting zzz
i even redid it all three times
Its taking sooo long to finish
how long it would take?
I can’t even figure out part of the first step. I know this is a dumb question, but when I select my iphone in itunes, how do I “browse and select the latest FW iOS 4.2.1 IPSW”? Please help!
Done everything like in article – doesn’t work. What is wrong ?
how long it would take?
Great job….!!!
Thank u…!!!
Masters Thanks u…for unlocking…. 3g bb 06.15.00 version 4.2.1
but Please help i have one problem..
i can not internet tethering with my pc (win 7)
what i do…??/
when install my bsnl sim tethering option is not there..
but when i install airtel sim it show tethering option…
please help…….
its taking too much time!!
hey guys just figured out why was it talking so much time
just keep on holding on to the home button it runs fast then!
cheers!
taking* not talking
sorry for the typo!
alright….done with the jailbreak but the airtel sim in my iphone still doesnt work!!!
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