How to Fix lockdown.cpp:57 Error in Cydia Impactor

A lot of users have been reporting a weird “lockdown.cpp:57” error in Cydia Impactor. Here are a few methods you can try to fix this error.

What does lockdown.cpp:57 error mean?

Each error in Cydia Impactor utility has a specific meaning. There are lots of error this tool throws and each one of them signifies that something is wrong with your setup (computer, device, iOS version, etc).

The lockdown.cpp:57 error signifies an issue with your device.

lockdown cpp 57

Even this error has different variants –


The only person who knows the meaning of each error is Saurik, the godfather of jailbreaking. He has been very busy of late and is nowhere to be found in the jailbreak community.

Thankfully, I have a few fixes for this error that are worth giving a shot.

How to Fix lockdown.cpp:57 Error in Cydia Impactor

Method 1 – Trust your computer

This is the main reason why Cydia Impactor throws this error in the first place. When you connect your iOS device to your computer, you must “trust” it.

When you get this alert, simply tap the “Trust” button.


Method 2 – Log into iTunes

If the above fix doesn’t work for you, this will most likely fix it. Open iTunes on your computer, go to the Account option and Sign In with your Apple ID and password. sign into iTunes

Method 3 – Use original cable

While not using the original cable is not much of an issue, it can make Cydia Impactor throw errors. Always use original cable and other accessories to minimize problems.

Method 4 – Use another Operating System

At the moment, this tool is incompatible with the 64-bit versions of Ubuntu. Therefore, you must use a different operating system to get it to work. If you are running iOS 11 firmware, I recommend you downgrade to a different firmware.

I will soon do a guide on fixing lockdown.cpp:57 error for iOS 11 users.

Here are a few more guides for fixing other errors in Cydia Impactor –

If you run into some issues, let me know the comments section below.

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