FlashAir W-04 Software Update Tool Download

Installation Procedure


  1. Download FlashAir W-04 Software Update Tool (for Mac OS) "FlashAirFWUpdateToolV4_v40004_Km.zip".
  2. When using Safari, "FlashAirFWUpdateToolV4_v40004_K.app" appears automatically. Depending on your environment or setting, "FlashAirFWUpdateToolV4_v40004_K.app" may not appear. If "FlashAirFWUpdateToolV4_v40004_K.app" does not appear, double-click "FlashAirFWUpdateToolV4_v40004_Km.zip" to unzip it.
  3. Drag and drop the unzipped "FlashAirFWUpdateToolV4_v40004_K.app" onto the required installation folder (for example, "Applications" folder).


  1. Download FlashAir W-04 Software Update Tool (for Windows ) "FlashAirFWUpdateToolV4_v40004_Cw.zip".
  2. Right-click the downloaded "FlashAirFWUpdateToolV4_v40004_Cw.zip" and select "Extract All...". Select a destination to save the extracted folder and click "Extract".
  3. Double-click "FlashAirFWUpdateToolV4_v40004_C.exe" in the extracted folder and Installation Wizard will launch.
  4. Follow the instructions from Installation Wizard and install the Tool.
    • FlashAir Software Update Tool (for Windows ) requires Microsoft .NET Framework. If required version of .NET Framework is not installed on your computer, the message which asks its downloading and installation will be displayed. So please install the software update tool with your computer connected to the Internet. And if Windows on your computer is not up to date, the installation of .NET Framework might fail. Please update your Windows using Windows Update.
    • You need administrative privileges on your Microsoft Windows computer to use the FlashAir Software Update Tool.

Operating Environment

One of the following operating environments on your computer is required to use the FlashAir W-04 Software Update Tool.

Devices equipped with an SD card slot
(For PCs equipped with a self- made or modified SD card slot, we cannot ensure the performance.)
Supported operating systems
macOS 10.12, 10.13, 10.14, 10.15
Microsoft Windows 8.1
Microsoft Windows 10 Version 1809/1903/1909/2004
  • KIOXIA Corporation has ended support for Windows Vista, Windows 7, Windows 8, and Windows 10 Version 1607/1703/1709/1803 because Microsoft Corporation in the United States has ended the support.


Be sure to select the file that is compatible with your equipment and operating system.

  • FlashAir™ W-04 64GB product image
  • FlashAir™ W-04 32GB product image
  • FlashAir™ W-04 16GB product image

For Mac OS

For Windows

Update History

Date Version Description
June 23, 2020 V4.00.04
(File name :
  • Support Windows 10 Version 2004.
August 1, 2019 V4.00.04
  • Bug fix.
May 14, 2018 V4.00.03
  • Stability improvements.
December 18, 2017 V4.00.02
  • A security vulnerability related to the generation and management of WPA2 key is modified.
October 5, 2017 V4.00.01
  • Bug fix.