Big Boss: Don’t Jailbreak iOS 4.3 GM, Messes Up Mobile Substrate


Apple released iOS 4.3 GM to developers last week and recently a few unofficial tutorials have popped up on the web detailing how to jailbreak this GM seed.

Big Boss just detailed on his blog a warning to get people to avoid jailbreaking iOS 4.3 GM as it will mess up MobileSubstrate, a requirement for installing jailbreak tweaks and such:

March 11th is the due date for the next iOS release. This is to support ipad2. As always, I give my standard warning not to update and wait for the jailbreak release. This time, I am giving some extra caution, however.

With 4.3 comes apple’s implementation of address space layout randomization (ASLR). In short, this will mess up the way mobile substrate works. You will need a new mobile substrate in order to use your favorite tweaks such as winterboard, sbsettings, bitesms, folder enhancer, etc. So you should definitely avoid 4.3 until an “official” jailbreak is released for it.

The final build of iOS 4.3 is being released this Friday. A jailbreak typically will arrive soon after, as the cat and mouse game continues to live on. I would recommend waiting for an official jailbreak from the iPhone Dev Team or the Chronic Dev Team, as always.

[Big Boss via iClarified]


  • Anonymous

    Thanks for the warning. My jailbreaking of iOS 4.3 remains on hold until the Dev-Team gives the OK.

  • Hyperextension

    I am JB on 4.3GM, iPhone4 and things work fine. SBSettings works perfectly. Winterboard did not nor FolderEnhancer. I have a lot of Cydia packages installed (145 as per PkgBackup) and about 75%-80% work just fine. Winterboard and themes don’t but majority of my tweaks work with no crashes.

  • Thanks for sharing this update.

  • Hyperextension

    And the Home Sharing is pretty sweet, as well as AirPlay now through your photo library (not just iPod app). The personal hotspot is awesome. Used it a couple of times.

  • is jailbreak having support for the latest version of the Jailbreak ………….