How can I install Cactus V6 firmware updater on Windows 8?

edited October 2014 in V6 Announcements and FAQ
Before installing the Updater / connecting your Cactus device, you need to disable the Signed Driver Enforcement (also known as digital signature) on your Windows 8.
  1. Hold down the Windows key on your keyboard and press the letter C to open the Charm menu, then click the gear icon (Settings).
  2. Click More PC Settings.
  3. Click General.
  4. Under Advanced Startup, click Restart Now. (NOTE: In Windows 8.1, the ‘Restart Now’ button has moved to ‘PC Setting -> Update & Recovery -> Recovery.’)
  5. After restarting, click Troubleshoot.
  6. Click Advanced Options.
  7. Click Windows Startup Settings.
  8. Click Restart.
  9. After restarting your computer a second time, choose Disable driver signature enforcement from the list by typing the number 7 on your keyboard. (Your computer will restart automatically.)
  10. After restarting, you will be able to install the Cactus Firmware Updater normally; however, Windows will display a warning message. When the warning appears, click Install this driver software anyway.
Note: The next time you restart your computer, driver signature enforcement will be in effect again. You will have to repeat this process for updating any new Cactus devices. If you wish to update devices with the same computer, we recommend installing the drivers for each one before you shut down or restart your computer.


  • Here's a post with a link to a video, showing the process. It does not seem to be as bad as it reads.
  • Wonderful. A video demonstration is better than hundreds of word.
    Ray Chan

    Senior Product Specialist
    Harvest One Limited
  • edited July 2015 PM
    Thanks, thanks, thanks!

    Today I bought two V6's and immediately had problem connecting them to the updater until I found this article.
    It solved my problem.
    I am a happy person again.  :-)

  • @12345 Glad to hear it helped. :)
    Antonio Lao
    Brand Manager

    To help us better help you, always state the exact firmware version installed on your Cactus device(s), such as: "1.1.013", "FUJ.1.002", "v.103".

    For the time being, Cactus V6 (MK1) running on firmware version 2.1.001 can be triggered by a V6 II (MK2) running on Multi-brand HSS firmware (e.g. 1.1.013) and not by X-TTL firmware versions: PEN.A.001 and OLY.A.001.  No schedule has been released yet. 

    Cactus RF60X / RF60 Firmware versions A01 and A02 currently ONLY works with PEN.A.001 and OLY.A.001.  Other "A" version of X-TTL firmware will be released soon. For both Multi-brand HSS and X-TTL firmware versions (FUJ, SIG, SON), install firmware version 103 / 205 on your RF60X / RF60.

    Cactus RF60 is now an off-camera TTL flash with firmware version 205 or later!

    Metz M400 (for Fujifilm) is now supported on the Cactus V6 II (HSS and TTL).

    Nikon D750 users please read this thread: 

    Fujifilm EF-X500 users please read this thread:

    Feel free to suggest an improvement or share product ideas. Contact us directly at  At Cactus, we listen. 
  • But is seems extremely irresponisble of a company not to provide signed drivers.
  • At the beginning, the firmware updater was developed based on Windows 7, which works smoothly. In  Windows 8 , it introduced digital signature which didn't exist in Win 7. That's why the Win 8 / 10 user may have to bypass the digital signature when installing the Cactus firmware updater.

    Rest assured! We are taking this concern in our future product development.

    All the best.
    Ray Chan

    Senior Product Specialist
    Harvest One Limited
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