172 Rockwell Automation Publication 1766-UM001O-EN-P - September 2021
Appendix D Use ControlFLASH to Upgrade Your Operating System
To clear this error:
1. Connect the controller Ethernet directly to the computer Ethernet port
using a crossover cable, or disable or uninstall any firewall VPN or virus
protection software running on the computer.
2. Cycle power to the processor.
3. Restart the firmware update procedure as described in the section Use
ControlFLASH for Firmware Update on page 164.
Communication error during TFTP transfer
This error message displays when there is a communication error during TFTP
transfer.
To clear this error:
1. Check that your Ethernet connections are intact.
2. Cycle power to the processor.
3. Restart the firmware update procedure as described in the section Use
ControlFLASH for Firmware Update on page 164
4. If the error still persists, connect the controller Ethernet directly to the
computer Ethernet port using a crossover cable, and then repeat from
step 2
.
Missing or Corrupt OS state The Boot Firmware runs the controller in this state.
When the controller is in this state, the controller shows either one of the
following:
• The POWER status indicator is solid ON and the RUN, FAULT, and
FORCE status indicators are blinking simultaneously. The BOOT screen
displays:
• The POWER and FAULT status indicators are solid ON and the BOOT
screen displays:
ATTENTION: Do not interrupt the update procedure, once you have begun to
download the firmware. If the update procedure is interrupted, the controller is in
a Missing or Corrupt OS state on the next power-up.
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