Either turn it off entirely or click and add Dolphin.exe .
The Dolphin folder may be set to "Read-Only," or the user may lack administrative rights to modify files in that directory.
Applications like Microsoft OneDrive often sync the "Documents" folder, which can lock Dolphin's files while they are being uploaded, causing a write failure. dolphin ios-fs failed to write new fst
Sometimes the emulator simply lacks the necessary permissions to write to its own folder. Right-click your Dolphin.exe file.
Scroll to and click Manage Controlled folder access . Either turn it off entirely or click and add Dolphin
The most common solution is to allow Dolphin through your security software.
Alternatively, add the Dolphin folder to the list in your antivirus settings. 2. Run as Administrator The most common solution is to allow Dolphin
Many security suites, including Windows Defender, use a feature called "Controlled Folder Access" that blocks unknown applications from writing to the "Documents" folder where Dolphin defaults its data.
If you are running Dolphin in "Portable Mode" (with a portable.txt file in the folder), the emulator may struggle if placed in a protected directory like C:\Program Files . How to Fix the "Failed to Write New FST" Error 1. Configure Windows Defender / Antivirus
If you are seeing the error message while using the Dolphin Emulator, it typically indicates that the emulator is being blocked from saving or modifying files in its user directory. This error often pops up during startup or when trying to save game data, and it is usually related to file permissions or interference from security software. What Does This Error Mean?