Rockwell Automation Publication 1766-UM001O-EN-P - September 2021 161
Appendix D
Use ControlFLASH to Upgrade Your Operating 
System 
The operating system (OS) firmware can be upgraded through the Ethernet 
port of the controller. To download a new operating system, you must have the 
ControlFLASH™ Upgrade Kit referred to in ControlFLASH Upgrade Kit User 
Manual, publication 1756-UM105
, as newer controller’s operating system (OS) 
firmware is prepared in DMK format and requires ControlFLASH version 
13.00 or higher.
Prepare for Firmware 
Update
Before upgrading the controller operating system, you must:
• Install ControlFLASH software on your personal computer.
• Extract the DMK kit that contains the latest Firmware – for 
ControlFLASH version 13.00 or higher only.
• Prepare the controller for updating.
Install ControlFLASH Software
To install ControlFLASH properly, see the Install ControlFLASH section in 
ControlFLASH Upgrade Kit User Manual, publication 1756-UM105.
If a ControlFLASH directory does not exist, one is created in your Program 
Files directory.
Use DMK Extraction Tool for Firmware Update
This section applies only to newer OS firmware prepared in DMK format, 
which requires ControlFLASH version 13.00 or higher.
Topic Page
Prepare for Firmware Update 161
Use ControlFLASH for Firmware Update 164
ControlFLASH Error Messages 171
Missing or Corrupt OS state 172