Two problems: (1) V6 firmware update on Mac (2) TTL with Fuji XT1 and V6

(1) I have tried to update the firmware on my newly purchased V6.  I have downloaded the firmware updated to my MacBook Air, connected the V6 via USB (having removed the batteries), and switched on the V6 (menu button plus either Tx or Rx).  The red light starts blinking.  The firmware updater screen 1.03 comes up but states there is no device connected.  I cannot get it to recognise that there is a V6 connected.

(2) I have bought a V6 specifically because it is recommended as a good choice for Fujifilm X system cameras.  I have a Fuji XT1 and a Fuji EF20 flash.  I have mounted the V6 on the camera and the EF20 on the V6.  I have swtched the V6 to TTL mode.  When I take a picture the flash operates at full power but does not operate in TTL mode.  So my pictures are completely over exposed.  How do I get the V6 to work in TTL with this Fuji kit? 


  • edited November 2015 PM
    I have no idea why the firmware update isn't working. Have you started the updater before you connect the V6? Perhaps Cactus can help you with this one.
  • Regarding the TTL pass-through, I'm sorry that I wrote earlier that it isn't supported for Fuji. It is, I erroneously mixed pass-through support with remote power control report.

    So, it should work and you may just need to wiggle the V6 in the hot-shoe a bit to find a better position.
  • @jmw934

    It could be your X-T1 hot shoe is not lining up with the V6 so you are having problem with TTL Pass Through.  There were a few users whose X-T1 experienced the same problem.

    You may refer to this thread:

    To fix this problem we will need to replace the bottom hot shoe mount on the V6. But you can first make sure the V6 is inserted fully on your camera's hot shoe.

    Thank you!
    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. 
Sign In or Register to comment.