Sorry, I think I misunderstood your post. If you have already moved your OS to your MMC without the WLAN fix already installed, then you may already have some corrupted data. Installing the fix now will stop the device from corrupting any more data, but it will not fix data that has been corrupted already. You can try installing the fix and see if your device is stable. Otherwise, I would recommend reflashing the device and follow my guide to boot off MMC again.