Hi,
You can try:
1. connect to the vcsa shell
2. check the update state: cat /etc/applmgmt/appliance/software_update_state.conf
3. Backup the update state config: cp /etc/applmgmt/appliance/software_update_state.conf /etc/applmgmt/appliance/software_update_state.conf.bak
4. Stop the Management Service: service-control --stop applmgmt
5. Delete the update state config file: rm /etc/applmgmt/appliance/software_update_state.conf
6. Start the Management Service: service-control --start applmgmt