How to fix lockdown.cpp:57 error on Cydia Impactor

Cydia Impactor is a graphical user interface (GUI) tool designed to work with mobile devices. However, it may give an error when being used, depending on the environment. One of such errors is lockdown.cpp:57.

The error lockdown.cpp:57 occurs when your phone and computer are not connected properly and when they are not communicating well. This article will show you in detail the causes of the error and how to fix it.

But first, let’s identify the variants of this error. They are:


Ways to fix lockdown.cpp:57 error on Cydia Impactor

Now, try these ways to fix the error:

1. Install the latest version of iTunes

Missing iTunes or running on an outdated version can lead to the lockdown.cpp:57 error. Installing the latest version of iTunes can thus prove helpful. To do so:

  • Click on the Start menu
  • Search for the Apple Software Update menu
  • Click on it to open
  • Check if there is an update of iTunes, download and install if any.

2. Disconnect then reconnect your device to the computer

At times, it could be that your computer and device are not communicating properly. This can be due to a faulty USB cable or your phone is not well connected to the computer.

In that case, you will have to first disconnect your phone from the computer then reconnect it. You may also try using a different USB cable in case the one you are using is faulty. Ensure that the USB cable is firm on both ends connecting to your computer and phone.

Read Also: Fix Cydia Impactor error: installer.cpp:71

3. Reset Location and privacy settings

If it occurs that you are connecting your phone to that computer for the first time, you have to Trust it first before you go any step further with anything. Corrupted location and privacy settings may come your way when trying to trust the computer. So, you will have to reset your Location and Privacy settings.

Please note that this procedure removes all the trust settings for any PC or Mac that your phone has been connected to. Going further, it even resets the location settings of individual apps to default.

To perform this operation:

Disconnect your phone from the computer

  • Open settings
  • Tap on General
  • Tap on Reset
  • Tap on Reset Location & Privacy

Thereafter, you should reconnect your phone to the computer. A pop-up message will appear reading, ‘Trust this computer?’ Tap on Trust and the problem will be solved.

4. Log into iTunes

If the above fixes don’t work, try logging into iTunes. The steps are:

  • Open iTunes on your computer
  • Lookup for Account option then click on it
  • Fill in your Apple ID and password
  • Click on sign in.

5. Restart your phone or computer

Restarting your phone and computer is also a way to fix the lockdown.cpp:57 error. This usually works when your phone or computer has technical issues. Since technical issues can also lead to the error, try restarting the devices.


Those are the possible causes of lockdown.cpp:57 error and how to fix it. I hope one of them will help you fix the error.

Read Also: Top Cydia Impactor alternatives