Summary
Insufficient Permissions
Dolphin lacks write access to the game ISO or the output directory. This often happens if: dolphin iosfs failed to write new fst
If Dolphin is struggling to write to the default Documents location, moving it to AppData or the local installation folder can resolve permission conflicts. Open Dolphin and go to File > Open User Folder . Close Dolphin completely. Dolphin iOSFS: "failed to write new fst" —
Folder Permissions: Dolphin may lack the administrative rights required to modify files in its current location, especially if installed in a restricted area like C:\Program Files. Attempt a small number of retries for EAGAIN/EIO-like