Step 1: Open Cydia on your device (Cydia is only available on jailbroken devices).
Wait for Cydia to finish loading data, then select the Manage tab.
Step 2: Press Sources in the Manage interface. Sources are where you fetch the app repository for your device.
Step 3: In the Sources interface, click on Edit.
Step 4: Click Add to add the app repository.
Step 5: Enter the URL http://cydia.sohastore.vn and then press Add Source. In reality, there are many sources that can assist you in installing AppSync. In this article, we use this source because you can quickly find the necessary AppSync.
Wait for a moment as Cydia adds the new Sources.
Step 6: After the Soha Store Source is successfully added, press Return to Cydia.
Step 7: Click on Soha Store
Step 8: Click on AppSync that corresponds to the iOS version you are using. For example, in this case, I'm using iOS 5.1.1, so I select AppSync for iOS 5+
Step 9: Click on Install to initiate the installation.
Step 10: Click on Confirm to proceed with the installation.
Wait for a moment, depending on the device and network speed, the download and installation process may be fast or slow.
Step 11: After successful installation, accept Restart SpringBoard to complete the installation.
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When Restart SpringBoard is triggered, the device will reload the interface.
Here, I have guided you on how to download and install Appsync for your iDevices.
Note: Only install Appsync if your device doesn't already have a similar tool, and vice versa.