Official Announcement From iPhone Dev Team Regarding iOS 4.2.1 – What does this mean for me and my device?

With Turkey Day a few days off, today Apple publicly released FW version 4.2.1.  As always,  unlockers please stay far far away from this official firmware (and all official firmware).  Wait for the ability to create custom 4.2.1. IPSWs that don’t update your !  If you’re not an unlocker, read on!

The best news of all is for owners of iPhone3G, older iPhone3GS, and non-MC 2G.  Due to a combination of our original pwnage2 exploit, the arm7_go exploit, 24kpwn, and limera1n, your is “just as jailbreakable as ever.”  You reap the full benefit of an untethered 4.2.1 .

Next are the owners of all the more recent devices.  The good news there is that due to geohot’s limera1n exploit, all recent devices can be jailbroken (this will be true until Apple released new hardware that fixes geohot’s limerain exploit in the bootrom).  The bad news is that right now, the 4.2.1 jailbreak is *tethered* on all of these recent devices.  A tethered jailbreak means that each time your device loses battery power or needs to be rebooted, you must attach it to a PC or Mac to boot into the jailbroken state.  @comex is working hard on a method that may untether the 4.2.1 jailbreak, but it will require you to have your 4.1 SHSH blobs in order to use it.  No word on how much more effort it will take though (please don’t bug @comex about it!).  (We also have an alternative method that may work, but @comex’s method is much more elegant.)

So when does all this 4.2.1 jailbreak action happen?  Well if you’re a JB developer or tinkerer, you’ve already probably used the redsn0w mentioned in our last post to jailbreak 4.2.1 and at least get SSH working.  But beyond that, there are still some last minute issues with MobileSubstrate and comex’s that are being fixed.  We’ll tweet and post a blog update when it’s all available (we hate to give ETAs, but barring any unforeseen problems, probably later today).

In the meantime, please make sure you have your 4.1 SHSH blobs for all your devices.  These will be important even for firmware beyond 4.1.

ultrasn0w unlock: After redsn0w is officially released with the new Cydia and kernel patches, we’ll be able to assess the unlock situation.  It’s already looking very promising though, so expect the unlock for the 3G and 3GS to be coming this week.  The i4 unlock is taking more effort though, and no further concrete info is available about that yet.

Feel free to ask questions in our comments section below, where we’ve got some awesome new additional moderators — sherif_hashim, dhlizard, and Frank55!

  • rodrigocbelo

    Two days passed and no news from dev-teams about the new ultrasn0w. Maybe then ‘re having problems with this surprising release 4.2.1?

    • http://iphoneblogr.com JaeM1llz

      Or maybe they are at home with their families for Thanksgiving… have some patience please, these guys have lives too, as much as everyone would love to believe that they don’t.

      • rodrigocbelo

        I’m sorry JaeM1llz. Where I live it’s not a holiday so I’ve forgot about it. Have a good Thanksgiving.

    • http://iphoneblogr.com thescragster

      MuscleNerd has confirmed today that progress is going well and it will be released by Sunday at latest :) Keep checking our website and we’ll let you know as soon as it’s out!

      • rodrigocbelo

        Yeah, I know. As a recognition I like a lot this blog. It’s organized, well written and is reliable. Everyday, I’m here. Continue, you’re doing a great job.

  • http://iphoneblogr.com/2010/11/official-announcement-from-iphone-dev-team-regarding-ios-4-2-1-what-does-this-mean-for-me-and-my-device/ tmstr

    quote “comex is working hard on a method that may untether the 4.2.1 jailbreak, but it will require you to have your 4.1 SHSH blobs in order to use it.”
    ========
    I got an new iphone 4 MC model.
    Which means i dont have a 4.1 SHSH blob..
    am i able to have an un-tethered jailbrake?
    if released.

    • JaeM1llz

      That means you will not be able to have an untethered jailbreak

      • http://iphoneblogr.com/2010/11/official-announcement-from-iphone-dev-team-regarding-ios-4-2-1-what-does-this-mean-for-me-and-my-device/ tmstr

        oke tnkx for your replay

        will do a downgrade to 4.1
        have a nice weekend!