Learn how to fix the Untrusted System File error in Apex Legends with our step-by-step guide

This guide explains how to fix the "Untrusted System File" error in Apex Legends, which is often related to Easy Anti-Cheat and DLL files.

How to Fix the Untrusted System File Error:


  • Locate Apex Legends Game Folder: Open File Explorer and navigate to the Apex Legends game installation directory. This is typically located in a folder similar to: This PC > Windows (C:) > EA Games > Apex > paks > Win64. The exact path may vary depending on where you installed the game.

  • Find the ui(01).dll File: Within the Win64 folder, locate the file named ui(01).dll.

  • Delete the ui(01).dll File: Right-click on the ui(01).dll file and select "Delete."

  • Launch Apex Legends: Launch Apex Legends. The game client should automatically detect the missing DLL file and re-download a fresh, verified copy. This process will resolve the "Untrusted System File" error.



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