S1 Firmware Updates

Interfit S1, S1a, TTL Remotes Firmware Updates

Interfit’s team of engineers are constantly striving to provide our customers with the very best user experience. As new features and camera compatibility become available, they will be made available here via simple firmware upgrades for both your S1 and S1a Flash Heads, and brand specific Remotes. All updates are compounded, so downloading the latest updates will unlock all of the new features in previous updates. Please be sure to read all instructions, as well as the Frequently Asked Questions at the bottom of this page.

New updates must be performed on both the flash heads and the remotes, unless otherwise stated.

S1 Flash Head Firmware Updates

Features and Compatibility Added:

  • Expanded 9-Stop Power Range (10.0 – 2.0)
  • Compatibility with Canon 1DX Mark II
  • Compatibility with Canon 5D Mark IV

S1 – Firmware Version 2.3 – MAC

S1 – Firmware Version 2.3 – PC

S1a Flash Head Firmware Updates

Features and Compatibility Added:

  • Expanded 9-Stop Power Range (10.0 – 2.0)
  • Compatibility with Canon 1DX Mark II
  • Compatibility with Canon 5D Mark IV

S1a – Firmware Version 2.4 – MAC

S1a – Firmware Version 2.4 – PC

TTL-C Remote for Canon Firmware Updates

Features and Compatibility Added:

  • Expanded 9-Stop Power Range (10.0 – 2.0)
  • Compatibility with Canon 1DX Mark II
  • Compatibility with Canon 5D Mark IV

S1 Canon Remote – Firmware Version “b 05” – MAC

S1 Canon Remote – Firmware Version “b 05” – PC

TTL-N Remote for Nikon Firmware Updates

Features and Compatibility Added:

  • Expanded 9-Stop Power Range (10.0 – 2.0)

S1 Nikon Remote – Firmware Version “b 04” – MAC

S1 Nikon Remote – Firmware Version “b 04” – PC

TTL-S Remote for Sony Firmware Updates

This latest firmware update resolves a compatibility issue between the S1 Remote for Sony and certain Sony cameras. This issue was discovered with the latest release of Sony’s firmware update for their mirrorless camera systems. If you are experiencing compatibility issues with your Sony mirrorless camera, please be sure to download this latest remote update. Note that this update only applies to your S1 Sony remote. No update is required for the S1 Flash Head to resolve this issue.

Features and Compatibility Added:

  • Resolved compatibility issue
  • Expanded 9-Stop Power Range (10.0 – 2.0)

S1 Sony Remote – Firmware Version b 03 – MAC

S1 Sony Remote – Firmware Version b 03 – PC


Download Instructions and FAQ’s

Download Instructions – MAC

  1. Double-Click the file you wish to download. The file will automatically download into your downloads folder.
  2. In your “Finder” window, locate the file and double-click to unzip the file.
  3. Double-click the unzipped file to open the application.
    1. Your computer security preferences may require you to confirm that you wish to open the files because Apple does not recognize the developer. If this happens, open System Preferences and double-click on Security & Privacy. You will be notified at the bottom of the window that the firmware file does not come from a trusted source. Click on “Open Anyway”.
  4. Follow the instructions on the firmware update window for upgrading your device.

Download Instructions – PC

  1. Double-click the file you wish to download. The file will automatically download into your downloads folder.
  2. In your “Downloads” window, locate the file and double-click to unzip the file.
  3. Double-click the unzipped file to open the application.
    1. Your computer security preferences may require you to confirm that you wish to open the files because your computer does not recognize the developer. If this happens, a pop-up window will open. Select “More Options”. You will be notified that the firmware file does not come from a trusted source. Click on “Run Anyway”.
  4. Follow the instructions on the firmware update window for upgrading your device.

Frequently Asked Questions & Troubleshooting

  • How do I know which firmware version my S1 or remote is using?
    • S1 – To see which version of firmware your S1 flash head is using: power the light off, press and hold the “test” button, and power the light back on. A number (1.5, 2.0, etc.) will appear on the LCD readout that corresponds to the firmware version.
    • Remote – To see which version of firmware your remote is using: power the remote on and press and hold the “mode” button. A letter and number (b 01, b 02) will appear on the LCD readout that corresponds to the firmware version.
  • I downloaded the firmware files but I can’t open them on my computer.
    • Your computer may consider the software to be a threat, as it is coming from an “unknown developer”. You may have to manually override the security settings on your computer. Please see the Download Instructions above for more details.
  • When I hook my device to the computer, I get an error message saying “the update software is not fit for this device”.
    • Each firmware file is specific to the device. This is a failsafe to ensure users do not inadvertently corrupt their device. If you see this message, double-check to make sure you downloaded the correct file. If you still get the error message, contact Interfit Support.

Be sure to follow all instructions on the firmware update screen. Failure to do so may result in damage to your flash or remote.

For older firmware versions for all devices, please visit the S1 Archived Firmware Updates Page.

©2017 Interfit Photographic Ltd

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