Prototype 2 Failed To Save Data Fix Work Jun 2026

async function saveProto2(proto2) const payload = JSON.parse(JSON.stringify());

: Click Allow an app through Controlled folder access > Add an allowed app .

The most common cause of this error is Windows Defender blocking the game from writing to your Documents folder.

Windows Defender blocks the game from writing files to your user profile directory. prototype 2 failed to save data fix

Few things are more frustrating than making significant progress in an open-world action game only to be hit with a "failed to save data" error screen. In Prototype 2 , this issue completely halts your ability to record campaign progress, upgrades, and collectibles. Because the game relies heavily on specific Windows folder permissions and legacy direct-write frameworks, modern operating systems frequently block its saving mechanism.

Prototype 2 was coded in an era when engine architecture struggled with non-ASCII or special characters (such as é , ö , ç , or Cyrillic/Asian scripts) in file paths. If your Windows username contains any of these characters, the game cannot read the save path. How to verify and fix:

Corrupted or missing installation files can cause save game scripts to fail. Steam has a built-in tool to scan your game files and automatically replace any anomalies. How to verify files: Go to your . Right-click Prototype 2 and choose Properties . Click on the Installed Files (or Local Files ) tab. Click the Verify integrity of game files... button. async function saveProto2(proto2) const payload = JSON

Go to your Prototype 2 installation folder (e.g., Steam\steamapps\common\Prototype 2 ). Right-click prototype2.exe and select .

How to Fix Prototype 2 "Failed to Save Data" on Windows 10/11

Below are the most effective, step-by-step solutions to fix this error and get your game saving properly. Run the Game as an Administrator Few things are more frustrating than making significant

If you are still struggling, ensure you complete these quick checks:

Click , select Folder , and choose the main Prototype 2 installation folder. Disable Steam Cloud Synchronization

Let the community know in the comments below. For more Prototype 2 troubleshooting, check out our guides on fixing the "Infinite Loading Screen" and "Black Box crashes."

: Browse to your game’s installation folder (typically C:\Program Files (x86)\Steam\steamapps\common\Prototype 2 ) and select prototype2.exe . 2. Run as Administrator