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Go from hobby to profession with Paul C. Buff, Inc.

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**Paul C Buff will be closed on Labor Day, September 4th, 2017.
  • Customer Care 1-800-443-5542
  • M-F 9am - 4:30pm Central

HUB Firmware Updates


Current Version Date
 ST 002.006.003 / ESP 002.003.006 February 1, 2023
  • ST v002.006.003
    • Fix bug where Nikon TTL flash exposure compensation offsets were shifting the power level in the wrong direction on the flash unit
    • This adds a lightning bolt icon when you trigger the HUB from a camera (the ESP update is also required for this)
  • ESP v002.003.006
    • Test flash from app can now trigger connected flash units
    • Lightning bolt icon when HUB triggered from camera (the ST update is also required for this)
    • Low battery status indicator of battery powered flash units on app
    • Center Pin Trigger (CPT) saves state on shutdown/reboot
    • Fixed issue where connected lights would flash when during a HUB ST firmware update
    • Fixed bug where toggling flash unit power in the app could drop a flash unit out of HSS

Do I need an update? How do I know which version I have?
When your HUB remote is connected to the app, you are able to view it's current firmware version under the HUB tab. The firmware can also be found directly on the HUB in its menu system. If you can’t find it, call us and we’ll help determine your version.



- HUB Remote
- Paul C. Buff, Inc. App (for iOS and Android)

HUB Remote Firmware History

The firmware 'ESP Firmware: ESP 002.003.006, ST Firmware: ST 002.006.003' update includes ALL PREVIOUS UPDATES that have been released.


ST 002.005.008 / ESP 002.002.008

  • Initial Release (10/28/2022)
  • Fixes bug in Canon HUB communication with camera that could cause some Canon models to switch settings.

ST 002.005.007 / ESP 002.002.008

  • Initial Release (06/29/2022)
  • Canon topshoe communication with external speedlight is now working with TTL.
  • The “TTL OR MAN” now has menu options TTL/MAN instead of ON/OFF

ST 002.005.005 / ESP 002.002.008

  • Canon topshoe communication with external speedlight is now working with TTL.
  • The “TTL OR MAN” now has menu options TTL/MAN instead of ON/OFF


  • Initial Release (12/02/2021)
  • TTL is now available for both Canon and Nikon.
  • To use TTL with your LINK, set the "TTL OR MAN" menu to TTL. If the LINK and HUB are not both displaying TTL, please cycle through the "MAN or TTL" menu on the HUB. 
  • A new menu option on the HUB can be found called “CTR PIN TRG”. By turning this on, you can use non-matching camera/HUB. For example, you can use a Canon HUB with a Nikon, Fujiflim, or Sony camera. The HUB will simply trigger a flash on your flash unit, but will not have TTL or HSS capabilities.
  • When charging, the battery icon will charge up until full.
  • Updating the frequency of your HUB in the BUFF Android or iPhone app will update the display on the HUB itself.
  • Nikon top hotshoe is fully functional – meaning a Nikon speedlight can use TTL when mounted to the HUB. A Canon speedlight will trigger, but TTL is not available.


  • Initial Release (9/10/2021)
  • Fixed an issue where a flash mounted on top of the Canon Hub would pulse multiple times when the shutter button was partially depressed
  • Fixed delay in sync jack trigger that could cause the flash to fire too late
  • Fixed issue where sync jack could fail to trigger


  • Initial Release (5/20/2021)
  • Improved the connection reliability between the Link and Hub during firmware updates 


  • Initial Release (2/23/2021)

NOTE: Downgrading to a previous version of firmware is NOT possible.