AppSync 5 for iOS 5 now Available to Download from Cydia
AppSync, a famous tweak to install and sync cracked apps on iPhone, iPad and iPod Touch has been released. AppSync 5 is an updated version for iOS 5 but it also works on iOS 4 firmware and above. It let you install and sync cracked apps with iTunes. You can find this app in Hackulous repo in Cydia which also contains Installous which let you download premium apps from Apps store for free.
Once you’ve jailbroken your iDevice you can use AppSync to patch installd file. Installd file in iOS is responsible for managing Apps installation and checking DRM signature. This tweak will help you to bypass DRM check so you can install and sync cracked apps with iTunes. If AppSync is not installed in your iDevice with Installous, you will get Installation failed: Invalid IPA error in Installous and when you’ll sync your iPhone, iPad and iPod Touch with iTunes, all your cracked apps would be deleted.
After installing AppSync 5, reboot your iPhone, iPad or iPod Touch and install a free app from Apple App Store before installing and backing up cracked apps to iTunes.
If AppSync is not working in your jailbroken iDevice, do tell us in comments.
Update: In order to save yourself from loosing your apps, make sure that you transfer your apps to Computer before following above steps by selecting your device from iTunes Sidebar and selecting Transfer Purchases.