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How to Fix Untrusted System File Error in Apex Legends

Lim How Wei
February 14, 2025

Apex Legends is a free-to-play Hero Shooter from Respawn Entertainment.

Master a growing roster of legendary characters with unique abilities.

The game combines Hero Shooter and Battle Royale, where powerful characters team up.

It offers diverse Legends, tactical squad-based gameplay, and innovative features.

In this guide, you’ll learn how to fix the Untrusted System File error in Apex Legends (Easy Anti-Cheat/DLL error)

How to Fix Untrusted System File Error in Apex Legends

Here’s how to fix the Untrusted System File Error in Apex Legends:

  1. Open File Explorer and locate the Apex Legends game folder (e.g. This PC > Windows (C:) > EA Games > Apex > paks > Win64).
  2. Locate the ui(01).dll file.
  3. Right-click the ui(01).dll file and select “Delete”.
  4. Launch Apex Legends and the error will be fixed!

Further reading

How to Fix Nvidia Reflex Greyed Out in Apex Legends

How to Fix Cross Progression Not Showing in Apex Legends

How to Fix Apex Legends Engine Error

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Lim How Wei

Lim How Wei is the founder of followchain.org, with 10+ years of experience in Social Media Marketing and 5+ years of experience as an active investor in stocks and cryptocurrencies. He has researched, tested, and written thousands of articles ranging from social media platforms to messaging apps.

Lim has been quoted and referenced by major publications and media companies like WikiHow, Fast Company, HuffPost, Vice, New York Post, The Conversation, and many others. One of his articles about the gig economy was quoted by Joe Rogan, who hosts The Joe Rogan Experience (the most popular podcast in the world), in the This Past Weekend podcast (the third most popular podcast in the world as of 2026) by Theo Von.

In his free time, Lim uploads personal finance videos on his YouTube channel, Lim Finance, to guide others on their financial journey. He also creates gaming guides, walkthroughs, solutions, and tips for the games he plays, helping players with their progression.