Upgrade the Qorestor instance that has the lowest build version number in order to match the build versions.
NOTE: QoreStor Version 7.2.1 or later is not compatible with any in-place converted DR Series appliances. The last compatible version for DR Series Appliances with in-place conversions is 7.2.0. Please
contact support if you want to do a DR Appliance in-place upgrade to QoreStor. QoreStor capacity license(s) will be needed post-upgrade.