Uploading the system image on ProxySG or ASG failed with the error '% All system image slots in use'.
ProxySG#(config)upgrade-path
ok
ProxySG#(config)exit https://<download URL/ProxySG_7.3.6.1-266990.bcsi>
ProxySG#load upgrade
Downloading from "https://<download URL/ProxySG_7.3.6.1-266990.bcsi>"
% All system image slots in use
The SGOS system version to be replaced is not selected.
To resolve this issue select the SGOS version to be replaced under ProxySG or ASG Management Console > Maintenance > Upgrade > Systems and then re-attempt to upload the system image in question