Click the synchronization tab, Click disqualify secondary, then click yes, Click ok and close the rmct – Rockwell Automation 1756-RMxx ControlLogix Enhanced Redundancy System User Manual User Manual
Page 255: Launch controlflash software and click next

Rockwell Automation Publication 1756-UM535D-EN-P - November 2012
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Upgrade from a Standard Redundancy System or to Another Enhanced Redundancy System
Appendix C
7. Click the Synchronization tab
.
8. Click Disqualify Secondary, then click Yes.
The secondary chassis is disqualified as indicated by the RMCT at the
bottom-left of the RMCT and on the redundancy module’s status display.
9. Click OK and close the RMCT.
Closing the RMCT helps prevent a timeout from occurring when the
redundancy module’s firmware is upgraded.
Step 7: Upgrade the Primary Chassis Redundancy Module Firmware
Wait 45 seconds before you begin updating the 1756-RM firmware. During this
time, the redundancy module conducts internal operations to prepare for an
upgrade.
1. Launch ControlFLASH software and click Next.
2. Select the redundancy module catalog number and click Next.
Status in RMCT
1756-RM2/A
1756-RM/B