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Previous System USB Resources - Clean iOS Lockdown Folder
Previous System USB Resources - Clean iOS Lockdown Folder

When experiencing connection issues or slowest on the desktop app, this process will provide a route to clear historical USB connections

Nestor Ramirez avatar
Written by Nestor Ramirez
Updated over a week ago


How to clear the Lockdown on MacOS Catalina

After updating your station to Catalina the system has started to slow or lose connection to devices.

The reason this is happening is because of the way devices are trusted by the computer. When you trust the device, it saves a trust file to a private folder on the OSX. This allows the device to reconnect without asking for trust in the computer.

The problem is that after you have connected 100s to 1000s of devices, each time you connect a device it has to search the folder for the trust file and then allow the device to connect or ask for trust.

Note: The latest version of Phonecheck Mac will automatically clear the files with every login. (1.3.259 and above)


Temporarily turning off the protection may be suggested during the troubleshooting of application connection issues. In order to resolve connection issues, the below actions are recommended.

Disable SIP

  • Reboot the system and hold down Command+R (⌘+R) keys simultaneously when you hear the startup chime; this will boot macOS into Recovery Mode

  • Once in Recovery mode, open a Terminal window from the Utilities drop-down menu at the top of the screen

  • Type in the Terminal: csrutil disable

  • Hit Enter, and you’ll see a message saying that System Integrity Protection has been disabled and that the Mac needs to restart for changes to take effect

  • Restart the machine (enter reboot in the Terminal, or use the Apple menu to find the Restart option)

Clear Lockdown folder of Previous Trust files

  • Close Phonecheck and disconnect all devices

  • Open Finder on Mac

  • In the Finder menu at the top of the Mac screen, click “Go”

  • In the Go submenu, click “Go To Folder…”

  • Type "/private/var/db/", click “Go”

  • Go to the lockdown folder, right-click “Get Info”

  • In the bottom right-hand corner of the Get Info menu, click on the lock and enter your admin password.

  • Underneath “Sharing & Permissions”, change the privilege of everyone to “Read & Write”

  • Open the “lockdown” folder and clear all files

Note: Don't delete the Lockdown folder only the contents.

Re-Enable SIP After Clearing folder of Contains

  • Reboot into Recovery Mode again (⌘+R at system chime)

  • Open a Terminal and enter: csrutil enable

  • Reboot

  • Startup Phonecheck and connect devices


How to clear the Lockdown on Windows

  1. Press Windows+R to open the Run box. Type %ProgramData% into the Open field, and then click OK.

  2. On the File Explorer window that shows up, double-click the folder labeled "Apple"

  3. Once inside open the “Lockdown” folder and clear all files

  4. Startup Phonecheck and connect devices

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