The user directory (often in Documents/Dolphin Emulator ) or the installation folder might be set to "Read-Only".
: Create a new, empty text file named portable.txt in the same folder as your Dolphin.exe . This forces Dolphin to store all settings and saves in that local folder instead of "Documents." dolphin iosfs failed to write new fst
When you see "failed to write new FST," Dolphin is telling you that it tried to update or create this critical file system index, but the operation was unsuccessful. Without a valid FST, the emulator cannot read or write game data properly. The user directory (often in Documents/Dolphin Emulator )