When attempting to downgrade an AS / ASP over IP or the direct connect USB cable, the new firmware fails to complete the install.
EcoStruxure Building Operation
- Automation Server (AS)
- Automation Server Premium (ASP),
When installing a a "New Database" in to an AS or ASP, it first needs to clear out what is in the controller and then load the firmware with a blank database. This process may require DFU mode to achieve the install.
To downgrade an Automation Server or Automation Server Premium to an older version of software, put the controller in to DFU mode before beginning the direct USB download of a new database.
To put controller in DFU mode, attach the Device Administrator to the AS via USB and press the reset button on the front of the controller 3 times in rapid succession.
Note: The IP address of the controller will be reset to default. (192.168.1.99)
Changing the version between v1.8 and the current version can often be achieved with a DFU reset, however the DFU reset clears out the history of the device which can be an advantage.