Tethered iPhone Jailbreak 4.2.1
* Before attempting to jailbreak your iPhone, you need to be sure that everything you need is in place. This includes an iOS 4.2.1 ipsw file which you will need in order to update and restore your device. You will also need to download and install an application called RedSnow 0.9.6b4, which will jumpstart the jailbreak process
* If you are running on an older iOS, you need to update your current firmware to 4.2.1 using the IPSW file you obtained earlier. Updating firmwares are done though iTunes (perfectly works on iTunes version 10.1). If your device is carrier locked, do not proceed with the update as iOS 4.2.1 automatically updates iPhone’s baseband.
* To commence with the jailbreaking process, start the RedSnow application you just downloaded. On RedSnow’s display, select the option “Install Cydia”. You can also select the other options indicated there if you prefer. Once you are done, click next.
* This is the part where you need to put your iPhone into DFU mode or Device Firmware Update mode. If you have jailbroken your device on a previous iOS, this should be easy. But if it’s the first time you encountered the DFU mode, don’t panic. Instructions are indicated on RedSnow’s interface. Basically, you just have to turn off your iPhone and make sure that it is plugged in to the computer. When you click on the “Next” button, Redsnow will then prompt you to press and hold both the “Power/Sleep” and “Home” buttons at the same time. After 10 seconds, release the “Power/Sleep” button but keep holding the “Home” button for another 15 seconds. By this time, the installation process would have started.
* As the installation progresses, there’s nothing much you can do but wait. Don’t do anything. At some point you might see some “Matrix-like” codes running on your iPhone’s screen – this is pretty normal. When the process is finished, your iPhone will automatically restart to a tethered iPhone Jailbreak 4.2.1
* Because this is a tethered jailbreak, the last step would be to ensure that you run your device on its jailbroken state every time the device reboots. You can do this by opening RedSnow and tick the option “Just boot tethered right now”.
Untethered iPhone Jailbreak 4.2.1
* For this method, you will need to download and install the iPhone jailbreak 4.2.1 application.
* Connect your iPhone to your computer. Make sure that you turn it off before starting the jailbreak process. Open the jailbreak application.
* Enter DFU mode in almost the same way you did as with the tethered jailbreak. If you successfully entered the DFU mode, the untethered jailbreak process will start.
* Wait for it to finish and the iPhone to reboot. It’s now time to click on the “Loader” icon in your iPhone’s homescreen to install Cydia.
If you have successfully attempted a tethered jailbreak on your iPhone and wanted to switch to an untethered jailbreak, you may do so by running GreenPoison using the steps indicated above.
Taking the Easier Jailbreaking Path
Updating your firmware to 4.2.1 is not advisable if your device is carrier locked. But if you want to jailbreak and unlock your iPhone at the same time, You can either opt for a tethered jailbreak using an unlocking freeware or an untethered jailbreak using a very effective iPhone jailbreak 4.2.1 application.
Why don’t you take a look at this software? Visit: iPhone Jailbreak 4.2.1 Software
This software is compatible with the 4.2.1 iOS, including the baseband that comes with it. So when you purchase this unlocking software, you are actually getting two solutions – jailbreaking and unlocking – for just the price of one.
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