After installing the APP, please follow the steps below to trust the developer, otherwise D-Back will not work

Step 1. First, click the Download button to install.

Step 2. Go to Stettings > General > VPN & Device Management.

Step 3. Then find the untrusted apps in the ENTERPRISE APPS.

Step 4. click "Trust".

Step 5. Finally, click Trust the developer.

Note: If your iPhone is using a newer iOS version (like iOS 16 or later), some steps may be different. Here are the updated instructions.

For devices with iOS 16 or later, you need to tap "Allow & Restart" to let the D-Back app access data on your iPhone.

Then, your device will restart and show the screen below. You need to swipe up to unlock and tap "Install Profile" to install the D-Back trust file on your device.

Please enter your device password again to verify, then you can start using the D-Back app!