We'll focus on the iPhone 4 here, as the warranty will have expired on most handsets. Theprocess is largely the same for other models (including iPod touches and iPad), so the principles still apply.
Before you start, back up your device in iTunes or iCloud. To force a backup in iTunes, right-click on your device in the list on the left and click Back Up.
It's also important to understand the difference between tethered and untethered jailbreaks. The former is something you don't want, as you'll need to connect your phone to a computer in order to reboot it. An untethered jailbreak means you can reboot the phone without consequence: everything will still work afterwards.
Also bear in mind that you must not update your iPhone's software when Apple releases an update. If you do so, it will overwrite the jailbreak and delete all the custom apps you've installed and settings you've made.
The following instructions work for devices running firmware 5.0.1. There is already an updated version of Redsn0w available for 5.1, but this is tethered, so you'll probably want to wait for an untethered version. If you want to jailbreak an Apple A5-powered device such as the iPhone 4S or iPad 2, you'll need Absinthe rather than Redsn0w.
We'll be using Redsn0w as it has always worked flawlessly for us, but there are a variety of other tools available. Download Redsn0w for Windows. Extract the files to a folder and then right-click on the Redsn0w application and choose Run as administrator. When the application launches, click the Jailbreak button.
Before you start, back up your device in iTunes or iCloud. To force a backup in iTunes, right-click on your device in the list on the left and click Back Up.
It's also important to understand the difference between tethered and untethered jailbreaks. The former is something you don't want, as you'll need to connect your phone to a computer in order to reboot it. An untethered jailbreak means you can reboot the phone without consequence: everything will still work afterwards.
Also bear in mind that you must not update your iPhone's software when Apple releases an update. If you do so, it will overwrite the jailbreak and delete all the custom apps you've installed and settings you've made.
The following instructions work for devices running firmware 5.0.1. There is already an updated version of Redsn0w available for 5.1, but this is tethered, so you'll probably want to wait for an untethered version. If you want to jailbreak an Apple A5-powered device such as the iPhone 4S or iPad 2, you'll need Absinthe rather than Redsn0w.
We'll be using Redsn0w as it has always worked flawlessly for us, but there are a variety of other tools available. Download Redsn0w for Windows. Extract the files to a folder and then right-click on the Redsn0w application and choose Run as administrator. When the application launches, click the Jailbreak button.
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