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Error - Upgrade using DFU mode system alarm AS status LED red


Potential for Data Loss: The steps detailed in the resolution of this article may result in a loss of critical data if not performed properly. Before beginning these steps, make sure all important data is backed up in the event of data loss. If you are unsure or unfamiliar with any complex steps detailed in this article, please contact Product Support Services for assistance.


AS status LED solid red for a few seconds followed by a quick blink.

Device administrator and/or event log shows ..."Error - Upgrade using DFU mode system alarm"


Product Line

EcoStruxure Building Operation


Automation Server


The indication of "Error – Upgrade using DFU mode" occurs due to the fact that a possible problem with writing to the file system has been detected when booting the system.

The configuration of the system could had been compromised as a result, although the issue is not necessarily fatal and therefore the AS is allowed to run and the situation indicated via the red status light.

A system alarm is also generated as a warning as seen in the screen shot above.


Since the AS file system could have been compromised, it must be re-initialized from scratch.

To clear the red light:

  1. Make sure a backup of the AS is available.
  2. Attach the Device Administrator to the AS via USB and put the AS in DFU mode (press the reset button 3 times in rapid succession)
  3. Install a new database
  4. Once the AS has had its FW and database reinstalled, restore the backup using Workstation.
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