In this comprehensive guide, we will explore effective methods to fix the problem of the full-screen mode not functioning correctly in Assassin’s Creed 4 Black Flag. As the sixth installment in Ubisoft’s popular action-adventure series, this game stands out with its focus on ship-based exploration in an open-world map, coupled with the existing melee combat and stealth system. However, recently many gamers have been experiencing difficulties with the full-screen mode, and we aim to provide practical solutions to overcome this issue.

Assassin’s Creed 4 Black Flag Full-Screen Issue

A considerable number of users have expressed concern that the full-screen mode in Assassin’s Creed 4 Black Flag is not working as intended, and the game can only be played in windowed mode. Despite trying various workarounds, such as Alt+Enter, F11, editing the config.ini, and even reinstalling the game, the problem persists. If you are facing the same issue, this guide will provide you with step-by-step solutions to rectify it, enabling you to enjoy the game in its full glory.

Solution 1: Replacing the EXE File

Surprisingly, for many players, replacing the game’s EXE file with a previous working build [26 June 2023 – 14:30:00 UTC] has successfully resolved the full-screen issue. To try this solution, follow the steps below:

  1. Open Steam and press Windows+R.
  2. Type in the command steam://open/console.
  3. Go to the Steam console and enter the command download_Depot 242050 242051 7598860626606919774.
  4. The Depot will be downloaded to the following location: steam -> steamapps -> content -> app_242050 -> depot_242051.
  5. Copy the file “AC4BFSP.exe” from depot_242051 and paste it into your game directory.
  6. Change the update priority to “Only update this game when I launch it.”
  7. Check if this resolves the full-screen mode issue in Assassin’s Creed 4 Black Flag.

Solution 2: Using Borderless Gaming

Another viable fix involves using Borderless Gaming. Follow these steps:

  1. Download and install Borderless Gaming from GitHub.
  2. Open Borderless Gaming as an admin and launch Assassin’s Creed 4 Black Flag.
  3. While in the game, press Alt-Tab to access borderless gaming.
  4. Search for “AC4” in the “Applications” list and click on the third button in the middle.
  5. Verify if the full-screen issue is resolved.

Please note that the developers are aware of this issue, but they have not provided an estimated time for the fix. In the meantime, the aforementioned workarounds are your best options.


By following the solutions provided in this article, you should be able to fix the full-screen mode issue in Assassin’s Creed 4 Black Flag. Whether you choose to replace the EXE file or use Borderless Gaming, these methods have proven effective for many users. Now, you can dive back into the thrilling world of Assassin’s Creed with a fully functioning full-screen mode.


  1. Q: Are there any other solutions for the full-screen issue in Assassin’s Creed 4 Black Flag?
    • As of now, the methods mentioned in this article are the most effective ones. Other solutions may surface in the future, but we will update this guide accordingly if that happens.
  2. Q: Will reinstalling the game fix the full-screen problem?
    • Reinstalling the game has not consistently resolved the full-screen issue, but you can try it as one of the troubleshooting steps.
  3. Q: Can I play Assassin’s Creed 4 Black Flag in windowed mode while waiting for a fix?
    • Yes, you can play the game in windowed mode until the full-screen issue is resolved. However, the methods outlined in this article are worth trying for the best gaming experience.
  4. Q: Are there any other known bugs in Assassin’s Creed 4 Black Flag?
    • While the full-screen issue is a prominent bug, there may be other minor bugs. Always ensure that you have the latest updates and patches to minimize potential problems.
  5. Q: Will Ubisoft release an official fix for the full-screen problem?
    • Ubisoft has acknowledged the issue, but there is no specific release date for a fix. They are actively working on resolving the problem, and once they roll out a fix, we will update this guide accordingly.