Sometimes the emulator simply lacks the necessary permissions to write to its own folder. Right-click your Dolphin.exe file.
The most common solution is to allow Dolphin through your security software. dolphin ios-fs failed to write new fst
Scroll to and click Manage Controlled folder access . Scroll to and click Manage Controlled folder access
Go to .
Select . If this stops the error, you can permanently set this by right-clicking the file, going to Properties > Compatibility , and checking Run this program as an administrator . 3. Relocate the User Folder If this stops the error, you can permanently
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