Redsn0w jailbreak already live for iOS 4.2.1 on all devices
As expected, that was fast. The current exploit used by jailbreaking tools greenpois0n, redsn0w and limera1n attacks the iOS device's boot rom, which is outside of the bits that Apple can change in software. As such, it cannot be addressed without issuing new hardware, meaning that, for the time being, all iOS devices are capable of being jailbroken using the same method.
Our own Erica Sadun reported iffy results from an early jailbreak of a dev build of iOS 4.2, but these have been resolved, and iPhone Dev Team are reporting that their redsn0w tool can now jailbreak all iOS 4.2.1 devices.
There are some caveats, however.
Firstly, if you use the ultrasn0w tool to unlock your phone (so you can use it with any carrier), then you have two problems. One, the tool itself doesn't work on iOS 4.2; two, if you allow iTunes to update to the newer versions of the baseband software in 4.2, then it might never work again on your phone. If you rely on carrier unlock, or if you think you might ever come to rely on it, you should always stay away from iOS updates until one of the dev teams supplies a tool to create custom IPSW files. This will give your phone all the creamy goodness of 4.2.1 but keep the old, unlockable baseband software in place.
Secondly, on newer devices (specifically iPhone 4, newer model iPhone 3GS, iPod touch 3G and beyond, and iPad) this is a so-called tethered jailbreak. This means that whenever you reboot your device, you have to physically have it connected to your Mac or PC with the jailbreak software running; otherwise, it'll boot back up without the jailbreak in place. Obviously this can be a serious nuisance.
Expect both of these caveats to be addressed in time, although there is , of course, no guarantees as to when. If you are not put off, then Redmond Pie have a really nice walkthrough of the jailbreaking process.
Thanks to everyone who sent this in.
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As expected, that was fast. The current exploit used by jailbreaking tools greenpois0n, redsn0w and limera1n attacks the iOS device's boot...
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Download new redsnow here:
http://spirit-blog-cipher.blogspot.com/2010/12/jailbreak-iphone-ipod-touch-ipad-ios-42.html
"Redsn0w jailbreak already live for iOS 4.2.1 on all devices" Oh no.
what is up?apple adapter will be broken ? I dont thinking. I like apple laptop very much.
It's very informative post and I am thankful to your for sharing that information.
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One more thing, if you're having trouble with redsn0w stopping in the middle of uploading the RAMdisk, and you're on Windows, be sure to right click the app, go to properties and change the compatibility to Windows XP SP3. You'll have to click through an authentication prompt when you launch it, but it should complete the jailbreak process successfully after that.
November 24 2010 at 2:12 AM Report abuse Permalink rate up rate down ReplyThis jailbreak is nowhere near as straightforward as previous jailbreaks. Cydia is broken, which means the jailbreak is 99% worthless. You can fix it, but it's not easy. To summarize, you have to jailbreak, then jailbreak again to install a custom package for SSH and APT, then SSH into your phone and install bsdiff/bspatch, then manually place the Cydia patch in the right folder, and then patch it with bspatch, then fix permissions.
If you aren't comfortable with issuing terminal commands and browsing your phone's file system then there's no point in attempting this one. To make matters worse, none of the sites have complete instructions. They all assume that you know some crucial piece that isn't explained. RedmondPie's is by far the best and most complete, but there's a typo in the terminal command that will throw users for a loop if they don't know what the line should say eg. "cd /Applications" instead of "cd/Applications".
I know that jailbreak users are generally a bit more savvy than the average Joe, but even for folks that have been jailbreaking since 1.0, this is a huge step up in complexity. Just wanted to give people fair warning.
The one thing that always confuses me about jailbreaking is the baseband thing. Could someone explain that more fully?
I don't need a carrier unlock now, but I'd like to keep it an option for the future if I ever sell the phone.
What baseband should I have now to make sure I can unlock in the future, and how do I know whether jailbreak releases are safe from an unlocking standpoint in the future?
Anybody know what bootrom version constitutes a new vs old 3GS? I am trying to figure out if it is safe to upgrade yet.
November 23 2010 at 11:11 AM Report abuse Permalink rate up rate down ReplyTried to jailbreak my iPad yesterday. Jailbreak went through, but I couldn't get Cydia up and running.
November 23 2010 at 11:10 AM Report abuse Permalink rate up rate down ReplyAfter you jailbreak the first time, you have to load up redsnow and check option 3. i forget what its called, but since you effectively restarted after the initial jailbreak, you have to apply option 3 again, dfu mode and all
November 24 2010 at 12:35 PM Report abuse Permalink rate up rate down ReplySo if I use redsn0w, then my battery goes dead, or i have to restart. The phone is unusable? or the phone is just a regular non-jailbroken phone?
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