Step 1: Open "Cydia" on iPhone or iPod Touch; Step 2: Click on "Manage"; Step 3: Now click on "Sources"; Step 4: "Edit"and then "Add". You have to add this source: "cydia.hackulo.us" and the click on "Add Source". Step 5: Once you have added search "AppSync for OS 4.0" on Cydia and install ...