iOS 4.2, Meet Cydia. Cydia, iOS 4.2. Now Place Nice Together.

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If you've gotten a jailbroken copy of iOS 4.2 running on your iDevice, you've probably discovered that Cydia has stopped running on said iDevice.  Bummer.  There is a Cydia update in the pipeline, but until it makes its public debut, here's a workaround to "re-Cydiavate" in the interim:

  1. Start with a jailbroken copy of iOS 4.2/4.2.1 GM.  Haven't jailbroken it yet?  For crying out loud, why not?  Our articles How To: Jailbreak iOS 4.2.1 GM on iPhone and iPod Touch With Redsn0w and How To: Jailbreak iPad 4.2 GM With PwnageTool are great places to start.  Also, make sure your device is SSH enabled.
  2. Fire up the Terminal app in OS X and type:
    apt-get install bsdiff
  3. Download the Cydia.patch for iOS 4.2.1. Copy it to /Applications/ by SSH’ing into your iOS device:
    cd /Applications/
    cp Cydia_ Cydia.bak
    bspatch Cydia.bak Cydia_ Cydia.patch
    chmod +x+s /Applications/
  4. Reboot.

Congratulations!  You're now the proud owner of an untethered, jailbroken iOS 4.2.1 device with full Cydia functionality.  That wasn't so hard now, was it?

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