BigBoss posted on his blog yesterday that if you enjoy using jailbroken tweaks such as winterboard and sbsettings, hold off on the big March 11th update. It’s always a cardinal rule to wait for the new jailbreak before updating to Apple’s new firmware, this time he says, use extra precaution.

Apple will be using ASLR (Address Space Layout Randomization) in its new iOS , which BigBoss says will damage the way mobile substrate works. It looks like the 4.3 jailbreak is going to need a patched mobile substrate file. Mobile substrate is just a few dynamic libraries of code in your iPhone’s OS (like windows .dll files)…

It has multiple purposes, but what it’s generally used for is a fail safe. It’s what tells your “” to run in the event an application crashes. Otherwise you’d have to force reboot your iPhone. Applications crashing, with no code to call it back to the home screen, is why you see so many of your Android friends pulling their batteries out ๐Ÿ™‚

So we thank BigBoss for the heads up, and urge you as well to avoid downloading Apple’s new 4.3 update this Friday. With previous beta versions of iOS 4.3 jailbroken, I don’t think it’ll be long after the big day before we see an official jailbreak with the mobile substrate fix.

As always, we will let you know as soon as that’s available. Has anyone updated to 4.3 GM and noticed issues with any of their jailbreak apps? Are you on 4.2.1 right now and plan on downloading the new update regardless? Tell us below!

  • I kinda want to… But then again id have to wait for the Jailbreak and it would be soooo agonizing.

    No my iPhone/iPad/iPod etc, is all staying at 4.2.1 till there is an official untethered Jailbreak for 4.3

    • Ray

      I’ve been seriously considering JBing, but I decided to wait until after the update us out. If I JB now, will I still be able to upgrade afterward, or do I have to get another JB version, and go through the whole process again?


      • You would have to jailbreak again after updating, and you would have to find a 4.3 JB.

        Wait until a proper 4.3 JB release comes out to jailbreak.

      • Ray

        Thanks. I was thinking that might be my best bet. Will do.

      • Ray

        I think I’ll go ahead and dobtge JB now, and do it again when the 4.3 JB comes out.

        At the risk of sounding like a real noob (which I am ;D), any suggestions as to a good source for the current (4.2.1) JB?


  • Sascha

    Why would I want an iOS4.3? My 4.2.1 works just fine. No need to “upgrade” as far as I am concerned.

    • suckerman

      “upgrade” should be “update”

  • Christopher A Williams

    why update. if all you get is the hot spot option then I don’t really see the reason, after all if your J/B you’ve already got something like PDA Net, or MyWi.

  • sOleFresh

    “Applications crashing, with no code to call it back to the home screen, is why you see so many of your Android friends pulling their batteries out ..”

    Loved that part..Lol

    • Brian

      Me too!! DROID DOESN’T!! LoL.

      • Xdestinx

        This really cracked me up.. Haha@ DroiD DOESN’T!ยก!ยก! I bet DroiD also doesn’t do those upside down question marks either. FAIL! I’m so sick of people with androids showing me their phones and trying to convince ME to switch to android platform . I just can’t help myself when the laughing starts…

      • Ray

        I had that same conversation with a friend who also gets that. You’ll never see an iPhone owner trying to “justify” his ownership when he sees a competing phone. But every time someone with a different product sees an iPhone, here they come with “oh, yeah, I didn’t get an iPhone because xyz, and 123… etc.”

        I mean who asked? Even if you don’t have your iPhone displayed, and you see an Android or other device, you can guarantee at some point early in the conversation you’ll hear SOMETHING about an iPhone: “yeah I got this because the iPhone, yada yada yada.” LOL!!! I don’t get it.

    • Manuel

      Same. I never knew that was the reason either. Def something to use on the Android fans, even though my friends have seen the jailbreak iPhone light ๐Ÿ™‚

      • Xdestinx

        Hahaha. Yep. My sentiments exactly. I love when they show me something cool that it can do that I’ve been doing for years….my silence is golden.

  • Tim Dorr

    “Applications crashing, with no code to call it back to the home screen, is why you see so many of your Android friends pulling their batteries out”

    Wow, not true at all. When an app crashes on Android, you’re first presented with the option to force it closed and send a bug report back to the developer. After that, the launcher kicks into play (basically, the Android equivalent of SpringBoard). I’ve only ever had to take my battery out to deal with a bad launcher replacement that was poorly written. But ADWLauncher and Launcher Pro are rock solid pieces of code and haven’t crashed on me once.

    • Eric

      He’s talking about rooted or jailbroken andriods. Are you?

      • Yes hรจ is. So hรจ already knows that he has a crappy lagging device. That is why he checked out this article

  • 00sigma

    4.3 has nothing I really need…I’m staying until they come out with a newer model!!!

  • QuarterSwede

    Interesting. So far I’ve had ZERO issues on my JB 4.3. I believe the only apps I have that use MobileSubstrate are SBSettings and OpenNotifier, both of which are still rock solid. At least if they crash and burn I’ll know why. So far, I’m very, very happy with 4.3. It’s smoother (folders no longer take forever to open and open smoothly), moving icons no longer takes ages to invoke, Personal Hotspot is brilliantly easy to use (can’t wait for a SBSettings toggle though) and Home Sharing is fantastic. I’m a happy camper. ๐Ÿ˜€

    • MikeG

      have you used Mywi with 4.3?

  • MikeG

    Does anyone who has upgraded to 4.3 know if MyWi now gives out Infrastructure signal or still just adhoc?

  • Mcsteven

    Yeah I’ll just wait for the jailbreak for 4.3. I like my tweaks too much to go without them for a while…

  • Cant wait for the IOS 4.2.1 iPhone 4 Unlock after the iOS 4.3 Release!

  • Holy moly! Good job I don’t jailbreak… :’)

    • Diddyo

      Then stop reading this site ipadbeans fag, we know what you’re trying to do..

  • AT0M!X

    Most of the times, the infrastructure mode in MyWi don’t work in 4.3 but my friend is a app developper for mac and got the mode working. ๐Ÿ˜€
    Also i have a question.
    I didin’t tried 4.3 now on my device but, (Without any addons except SBSettings for memory mesuring) does it use less memory than 4.2.1?
    If yes, my iPod touch 2 with the new iBoot wil be able to handle more tweaks at once in 4.3 than in 4.2.1. xP

    • MikeG

      Can you let us know how he made it work? Thanks

  • iXanczy

    I’m kinda lucky, because I have the iPod touch second generation and the 4.3 update won’t include it.
    I’m also about to buy the iPad 2, and it will be on 4.3 since it is right from the factory.

    • Spencer

      Lucky ๐Ÿ˜›

      • F17

        I love you too… (thank google mobile app) ๐Ÿ˜›

  • Old Tom

    im still jailbroken @ ios 4.1 and other than the revamp of safari, i dont really see any reason to go thru the hassle of waiting for my jb apps and themes to get updated just to have a slightly faster safari use.
    Doubt i’ll do any updates til forced to by a large number of app store apps not updating and working properly because of still being on 4.1. if its working fine currently @ 4.1, no sense in rocking the boat and making work for myself. I’ll probably just wait it out til hardware update time with ip5 and see what the deal is then. June-september of this year isnt that far off.

  • @W8ingonanipad

    Hey anyone that will be waiting in line for an ipad2 that has a twiter, follow @w8ingonanipad and see pics and stories from all over of how it’s going everywhere else where other people are waiting. Just for kicks and giggles.

  • luzi

    hi…i have iphone4 4.2.1 baseband 3.10.01…when they gone to can unlock this baseband………… any notice please letme now…i realy interesting and do the inlock tha way can a used my iphone in my carrier…please……any thing let me now…..

  • Jj

    Im planing to update to 4.3 i have a shsh blobs saved for 4.2.1 can i restore it back on 4.2.1 again if i want to?

  • Jj

    Can i restore back on 4.2.1 from 4.3 if i have my shsh blobs saved?

    • DomPerignon

      Yes; you can.

  • Simon Scully

    I have updated to 4.3 gm and have jb and made multitouch gestures available. I use sbs settings and lock calendar without any problem. I have only tried one time an app close down while beeing in it. Otherwise everything is going as smooth as 4.2.1 and cydia seems to work fine with 4.3..

    You can restore back to 4.2.1 if you have saved your shsh. Just go offline on apple server and change that file.

    • Khaled

      Hi !

      I would like to know where to find a jb, an effeficient one, for IOS 4.3


  • SillyBear

    On 4.1
    Zero incentive to upgrade until I see iOS5 features.

  • Esquivo

    I’m using 4.3 GM on my 3GS, and so far everything’s working.

  • Im just waitin to 4.3 just bcoz My iphone 4 is hungry for Ultrasn0w…….nothin else…..iknow develovers job is not easy… just after apple fix they need to work again… but hatsoff dev-team, you are the guys who tell apple that they have some bugs in iOs which they fixes in future……..iwould hv never purchased the iPhone..thank u very much…

  • cactus

    just updated to 4.3 officially from apple, it looks great to me, i like the personal hotspot so much.

  • Idiot

    I completely screwed up and updated without thinking i’d lose my JB. Can someone explain how to go back if possible? If not, will I still have all of my features when the new JB comes out? Yes, I’m an idiot.

    • Brian


  • Idiot

    I know this. Simply connected and said, oh hey, update. Got distracted and then realized . . . WAIT!!!! Too late. I guess I just have to wait until the new JB comes out to get my favorite features back. Sucks, because I feel like my iphone is so 2005 now.

  • BobdigiPhone

    Just use tinyumbrella to restore back to 4.2.1

  • BobdigiPhone

    Just use tinyumbrella to restore back to 4.2.1.

  • Live

    Or patch your hosts file…

  • ipoduser528 on youtube

    I cant jailbrake my own ipod 4 because of my parents but I jailbroke my friends and it is beast. I just updated yesterday-3/9/11- to iOS 4.3 and it isnt really worth loosing a jailbreak for. I suggest everyone to

    I cant jailbreak my own ipod 4 because of my parents but I jailbroke my friends ipod 3g and Ive learned ALOT. I also updated my ipod 4 yesterday-3/9/11- to iOS 4.3 and putting both my jailbreak experience and my experience with 4.3… i suggest NOT updating to iOS 4.3
    Stay away from it until they come out with an untethered jailbreak for it. I think beta 3 is the one out right now and they are releasing the actual iOS on the 13th of March. So visit my channel for some Cydia sources and other jailbreak stuff. Dont make fun of my tutorials though. Lol! STAY AWAY FROM iOS 4.3 UNTILL UNTETHERD JAILBREAK IS RELEASED. also, someone message me on my youtube channel… ipoduser528 when jailbreakme for iOS 4.2.1 and 4.3 come out. THANKS!

  • cscash241

    i update to 4.3 and it sucked so after about 5 minutes i downgraded to 4.2.1 (i have an iPod touch 4g) too many bugs and not enough hacks in 4.3

  • sup guys its me again. i have something to say about downgrading. this works for everything except 4.2.1 on the ipod touch 4g. go to my channel cause im bout to make a video: ipoduser528 on youtube.

  • Jordanz Ocha

    I have iOS iphone5s 8.1.2 jailbrokin Almost lost it when my computer told me to update but thankfully my freind told me not to update or I will loose my jailbreak.