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Celestial Firmware Update


Current Version Date
v001.005.102 March 28, 2023

CELESTIAL v001.005.102:

  • Now compatible with the Sony HUB in HSS, TTL, and manual exposures.


Do I need an update? How do I know which version I have?
When your Celestial flash unit is connected to the app, you are able to view it's current firmware version in the 'flash card' for that particular unit. 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)

Celestial Firmware History

The firmware 'v001.005.102' update includes ALL PREVIOUS UPDATES that have been released.

vv001.004.108 (Released 11/15/23)

  • Removed bug that would occasionally display a -0.2 error on the unit and power down the unit unexpectedly.

vv001.004.107 (Released 10/19/23)

  • Enables faster scrolling through flash and model power. By holding down the encoder button for 3s, the user can then adjust the flash or model power by full-stop increments instead of 0.1 stops.
  • Fixed bug where the flash unit would occasionally detect an error and force the unit off when the error was not present.
  • Fixed bug where if a flash unit was remotely toggled off and back on too quickly, it would turn off the internal radio and stop the user from turning the unit back on remotely.

v001.004.103 (Released 08/28/23)

  • Fixed bug where the battery would fail to communicate the proper state of charge information when first powering on the unit.
  • Improved performance when controlling the slave eye using remote device.
  • Please note this firmware update will take ~ ½ the amount of time as previous Celestial updates. However, your HUB must be on the latest firmware to complete the update.

v001.004.101 (Released 04/13/23)

  • Improved TTL performance on both Nikon and Canon systems.
  • Improved compatibility with FusionTLC’s Raven. The flash unit’s configuration is no longer overwritten by the Raven – flash mode and model mode now remain the same when powering on via the Raven.
  • Deactivate Zone D (CH 4, 8, 12, 16) TTL as it is not supported by camera manufacturers.
  • A user can shut down the battery completely by holding down the power and encoder button for 5 seconds. The only way to wake the battery is by connecting it to the charger.
  • Updated the battery indicator on the user interface to display battery life more accurately.
  • Fixed bug where battery display would come up showing less than full after charging the battery overnight.

v001.003.108 (Released 03/29/23)

  • Improved color consistency and output power in Color Mode
  • TTL zones have been remapped. Zone A = CH 1, 5, 9, 13. Zone B = CH 2, 6, 10, 14. Zone C = CH 3, 7, 11, 15. Zone D (if supported by camera) = CH 4, 8, 12, 16.
  • TTL is now compatible to be used with with FusionTLC’s Raven. See their website for a list of supported camera models.
  • Fixes bug when communicating with FusionTLC’s Raven where it could not toggle lights in CH 2, 3, or 4 into HSS mode by toggling the shutter speed above X sync on your camera.
  • Fix bug where unit leaves thermal mitigation mode when the battery overheats
  • Fix bug where rotary encoder moves 0.1 f-stop from the previous value when the unit is first powered on