Scroll down to and click Add or remove exclusions .
Which version you are running (e.g., Windows 11, Android 14).
The IOSFS failed to write new FST error is a symptom of the complex balancing act Dolphin maintains between accuracy (emulating Wii security) and user convenience.
Short-term mitigations
Ensure the permission level is actively set to rather than the restrictive "Allow access to media only". 2. Relocate Core Directories
If standard pathing and permissions remain completely blocked, forcing Dolphin into bypasses standard directory targets completely. This relocates all virtual Wii files directly into the emulator folder itself.
Your game saves ( .gci files) are often stored in the Wii folder, but we're going to reset it. dolphin iosfs failed to write new fst
Some older versions of Dolphin (pre-5.0) had unstable ISO rebuilding code. Certain development builds (beta or nightly) might also introduce temporary regressions in IOSFS handling.
The "dolphin iosfs failed to write new fst" error is a well-known but ultimately non-critical issue that has frustrated many Dolphin users. While the error message appears technical and serious, it primarily points to a simple conflict: another program on your computer is momentarily interfering with Dolphin's attempt to update a small but important file.
Click and ensure you apply changes to all subfolders and files. 4. Move the Dolphin User Folder Scroll down to and click Add or remove exclusions
If you are still hitting a wall with this error, let me know:
the software is unable to save or update the virtual file system metadata (the File Selection Table, or FST) on the emulated Wii NAND . This is most often a permissions issue
If Dolphin is struggling to write to the Documents folder, you can force it to use a different location. This relocates all virtual Wii files directly into
