AppSync 4.2 for iOS 4.2 jailbroken firmware is now available in the Cydia. AppSync 4.2 patches MobileInstallation file and lets you install cracked apps on iOS 4.2. Once you’ve AppSync for iOS 4.2.1 installed on your iPhone/iPad/iPod Touch running jailbroken iOS 4.2.1, you’ll be able to install cracked apps (.ipa).
Install AppSync 4.2 for iOS 4.2 Firmware
Assuming that you’re running jailbroken iOS 4.2.1, Simply go to Cydia.
Add the following source: http://cydia.hackulo.us (How to)
Now search for AppSync for OS 4.2 in Cydia.
Install AppSync for OS 4.2.
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