S1a Firmware | Interfit Photographic

What's new in this version?

- Added compatibility with Sony A7RIII, A9, and A7III

- Added manual compatibility for all cameras

- Added ability for simultaneous HSS & TTL modes

*NOTE: firmware must be updated on lights AND remotes for proper functionality*

Installation Instructions

Make sure to read all directions when installing your firmware to avoid any possible damage to your device!

Click the download button above with the Windows logo. The file will automatically download into your downloads folder when you press "save."
In your File Explorer window, within the “Downloads” folder, locate the file.
Double-click the .exe file to open the application.Follow the instructions on the firmware update window for upgrading your device.
- Note: 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”.
Follow the instructions on the firmware update window for upgrading your device

Click the download button above with the Apple logo. The file will automatically download into your downloads folder when you press "save."
In your “Finder” window, locate the file and double-click to unzip the file.
Double-click the unzipped file to open the application.Follow the instructions on the firmware update window for upgrading your device.
- Note: 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”.
Follow the instructions on the firmware update window for upgrading your device

Remove the selector knob from the back panel of your flash unit simply by pulling it off. Don't worry, it won't break!

S1a – To see which version of firmware your S1a 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.

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.

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.