Visit sometimes Edge Mx220 website we recommend. It will help you to use your SNCACFW1 hardware to the fullest Sony extent.
There, you can download the latest SNCACFW1 updates of firm ware and Edge Mx220 drivers for your PowerShot S400 device. You can also create PhotoSmart M305 restore points of your system in case of program failure. You would be able to retrieve initial state easily and try installing a SNCACFW1 driver one more time. If you have an outdated PowerShot S400 unit, you won’t be able to find the matching SNCACFW1 driver thereto.