2. Check module compatibility: Some black domain modules are not compatible with your device or Android version, resulting in wrong signature. Try to disable or uninstall the recently installed module, and then restart the device to see if the problem is solved.
3. Clear cache and data: enter the application manager of the device, find the black domain application, and clear its cache and data. Then restart the device and try to use the black domain again.
4. Reinstall the black domain: If the above steps can't solve the problem, try to uninstall the black domain application and download and install the latest version of the black domain from a reliable source (such as official website or an application store).
5. Restore the system status: If the problem still exists, you can consider restoring the equipment to the factory settings to clear all the modifications and settings that cause the signature error. Please note that this will erase all data on the device, so be sure to back up important files in advance.