S1 Archived Firmware Updates

S1 Logo WEB   ARCHIVED Firmware Updates

The latest firmware updates for the S1, S1a, and the Interfit TTL remotes can be found on the Interfit S1 Firmware Updates Page. Firmware updates on this page are for archival purposes only and do not contain the latest compatibility and performance upgrades.

Announcing: Sony Bug Fix

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. Please see FAQ’s and instructions for downloading these files at the bottom of the page.

S1 Sony Remote Firmware Version “b 03”:

The S1 Sony Remote Firmware Version b 03 offers the following:

  • Resolved compatibility issue

S1 Sony Remote – Firmware Version b 03 – MAC

S1 Sony Remote – Firmware Version b 03 – PC

Announcing: Compatibility with Canon 1DX Mark II

This latest firmware update adds compatibility with the Canon 1DX Mark II. Users of this camera will now have complete compatibility with all functions of the S1. An update is required to both the S1 flash head and the remote in order to unlock this function. Please see FAQ’s and instructions for downloading these files at the bottom of the page.

S1 Flash Head Firmware Version “2.3”:

The S1 Flash Head Firmware Version 2.3 offers the following:

  • Compatibility with Canon 1DX Mark II

S1 – Firmware Version 2.3 – MAC

S1 – Firmware Version 2.3 – PC

S1 Canon Remote Firmware Version “b 05”:

The S1 Canon Remote Firmware Version b 05 offers the following:

  • Compatibility with Canon 1DX mark 2

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

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


Announcing: Expanded 9-Stop Power Range and Compatibility with Canon 5D Mark 4

Interfit’s team of engineers has bundled together two great features into one update!

  • Expanded the flash power range to 9 full stops. Adding these two additional stops of flash power to the bottom of the range allows users to power their S1’s down farther than they could before. This is especially important when shooting with wide apertures, as only a small amount of light is required. The power range on the current firmware is represented by a range of numbers from 8.0 – 2.0 (500Ws – 7.8Ws). This new 9-stop power range is represented by a range of numbers from 10.0 – 2.0 (500Ws – 1.95Ws). An update is required to both the S1 flash head and the remote in order to unlock this function. Please see FAQ’s and instructions for downloading these files at the bottom of the page.
  • Added compatibility for the new Canon 5D Mark 4. Users of this camera will now have complete compatibility with all functions of the S1. An update is required to both the S1 flash head and the remote in order to unlock this function. Please see FAQ’s and instructions for downloading these files at the bottom of the page.

S1 Flash Head Firmware Version “2.2”:

The S1 Flash Head Firmware Version 2.2 offers the following:

  • Expanded 9-Stop power range
  • Compatibility with Canon 5D Mark 4

S1 – Firmware Version 2.2 – MAC

S1 – Firmware Version 2.2 – PC

S1 Canon Remote Firmware Version “b 04”:

The S1 Canon Remote Firmware Version b 04 offers the following:

  • Expanded 9-Stop power range
  • Compatibility with Canon 5D Mark 4

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

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

S1 Nikon Remote Firmware Version “b 04”:

The S1 Nikon Remote Firmware Version b 03 offers the following:

  • Expanded 9-Stop power range

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

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

S1 Sony Remote Firmware Version “b 02”:

The S1 Sony Remote Firmware Version b 02 offers the following:

  • Expanded 9-Stop power range

S1 Sony Remote – Firmware Version “b 02” – MAC

S1 Sony Remote – Firmware Version “b 02” – PC


Announcing: Compatibility with Sony Mirrorless Camera’s

Sony users now have complete access to the S1’s HSS and TTL functions! This update only applies to the S1 flash head. No remote update is necessary. Please see FAQ’s and instructions for downloading these files at the bottom of the page.

S1 Flash Head Firmware Version “2.1”:

This most recent version of firmware offers compatibility with Sony Mirrorless camera’s, allowing users to shoot in High-Speed Sync, Manual, and TTL. Please note that this firmware update does not allow simultaneous HSS and TTL, that functionality will be available at a later date. The S1 Flash Head Firmware Version 2.1 offers the following:

  • Compatibility with Sony a6000, a6300, A7, A7II, A7S, A7SII, A7R, A7RII

S1 – Firmware Version 2.1 – MAC

S1 – Firmware Version 2.1 – PC


Announcing: S1-HSS and TTL at the same time!

We are pleased to announce that the firmware upgrades provided below will now enable your S1 to perform with HSS and TTL at the same time! Please see FAQ’s and instructions for downloading these files at the bottom of the page.

S1 Flash Head Firmware Version “2.0”:

This most recent version of firmware offers compatibility with several newer camera models and also allows for users to use TTL metering while in High-Speed Sync mode. Please note that this firmware update also requires an update to the individual remotes (posted below). The S1 Flash Head Firmware Version 2.0 offers the following:

  • Compatibility with Canon 5DS, 5DSR, and 7Dii
  • Compatibility with Nikon D800 and D810
  • The ability to use TTL while in HSS mode (Canon and Nikon only)
  • Compatibility with S1 remotes using firmware version “b 02” for Nikon and “b 03” for Canon

S1 – Firmware Version 2.0 – MAC

S1 – Firmware Version 2.0 – PC

S1 Canon Remote Firmware Version “b 03”:

This most recent version of firmware offers compatibility with the Canon 5DS, 5DSR, and 7Dii. This update also allows for users to use TTL metering while in High-Speed Sync mode. Please note that this firmware update also requires an update to each individual S1 Flash Head (see above). The S1 Canon Remote Firmware Version 2.0 offers the following:

  • Compatibility with Canon 5DS, 5DSR, and 7Dii
  • The ability to use TTL while in HSS mode
  • Increased remote battery life

S1 Canon Remote – Firmware Version “b 03” – MAC

S1 Canon Remote – Firmware Version “b 03” – PC

S1 Nikon Remote Firmware Version “b 02”:

This most recent version of firmware offers compatibility with theNikon D800 and D810. This update also allows for users to use TTL metering while in High-Speed Sync mode. Please note that this firmware update also requires an update to each individual S1 Flash Head (see above). The S1 Nikon Remote Firmware Version 2.0 offers the following:

  • Compatibility withNikon D800 and D810
  • The ability to use TTL while in HSS mode
  • Increased remote battery life

S1 Nikon Remote – Firmware Version “b 02” – MAC

S1 Nikon Remote – Firmware Version “b 02” – PC

©2017 Interfit Photographic Ltd

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