Sometimes when synchronizing with iTunes on the iPhone, an error message appears "iTunes failed to connect to iPhone because an invalid response was received from the device". Any attempts to restore the firmware, uninstall, and reinstall iTunes does not bring the desired result, and the error message does not go away.
Solving this problem is not as difficult as it may seem at first glance. All you need to do is delete the files in the Lockdown folder of your device.
Initially, you need to disconnect your device from the computer. Also, be sure to close the iTunes application. Next, follow the steps depending on the program you use.
After completing all the actions, the computer must be rebooted.
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