The folder where Dolphin saves its configuration and emulated data might accidentally be marked as "Read-Only." Step-by-Step Solutions to Fix the Error
Open the Windows , search for Windows Security , and open it. Navigate to Virus & threat protection →right arrow Manage settings . dolphin iosfs failed to write new fst
The most common culprit is Windows Defender or third-party antivirus software locking the fst.bin file. The folder where Dolphin saves its configuration and
Some AV software locks writes to emulator files. Some AV software locks writes to emulator files
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If you need to add/replace files larger than the originals, do not use in-place replacement. Instead:
: Right-click your "Dolphin Emulator" folder (usually in Documents), select Properties , and ensure Read-only is unchecked for the folder and all its contents.