Unable to patch vCenter server from VAMI, check updates shows "The CD drive does not have a valid patch ISO or has an unsupported version"

Products

• VMware vCenter Server

Issue/Introduction

• As per the Patching/Updating VMware vCenter Server Appliance VCSA through Appliance Management Interface VAMI after mounting the ISO file as a CD-ROM and doing CHECK UPDATES (Option 2, Step 6) there are no valid updates seen.
• Encountered error similar to below when checking for updates from the iso on VAMI

• The following entries could be observed in the below logs :
  
  /var/log/vmware/applmgmt/software-packages.log

  <timestamps> [1700264]DEBUG:vmware.appliance.update.update_b2b:discoverLocalUpdate failed. No manifests found
  <timestamps> [1700264]ERROR:vmware.appliance.update.update_b2b:Got Exception during discover updates {messages : [{'id': 'com.vmware.appliance.update_error', 'default_message': '%s', 'args': ['The CD drive does not have a valid patch ISO or has an unsupported version']}], data : None, error_type : NOT_FOUND} :
  <timestamps> [1700264]INFO:vmware.appliance.update.update_pending:No updates found
  <timestamps> [1700264]INFO:vmware.vherd.base.software_update:The CD drive does not have a valid patch ISO or has an unsupported version

  
  /var/log/vmware/applmgmt/applmgmt.log

  <timestamps> [8997]DEBUG:vmware.appliance.update.update_b2b:discoverLocalUpdate failed. No manifests found
  <timestamps> [8997]ERROR:vmware.appliance.update.update_b2b:Got Exception during discover updates {messages : [{'id': 'com.vmware.appliance.update_error', 'default_message': '%s', 'args': ['The CD drive does not have a valid patch ISO or has an unsupported version']}], data : None, error_type : NOT_FOUND} :

   

Environment

VMware vCenter Server 7.x , 8.x

Cause

Possible causes are:

• The CD-ROM is not in a connected state
• A previous ISO was mounted, and not ejected before mounting the patch ISO
• The install ISO was mounted instead of the patch ISO. 
• An outdated (lower) version of the vCenter Server patch, which is lower than both the required target version and the currently installed vCenter Server version, was uploaded to the datastore

Resolution

• Right-click the VM, select Edit Settings, and ensure the CD-ROM is showing as connected.
• Open an SSH session to the vCenter VM, and run the command "eject /dev/cdrom" to eject the current ISO. Then detach the CD-ROM and re-attach the correct patch ISO.
• Verify the filename and version of the targeted version of the patch. A patch ISO will end with "-FP.iso". 
• Proceed with the patch update as per any of the below methods:
  • Patching/Updating VMware vCenter Server Appliance VCSA through Appliance Management Interface VAMI
  • Patching vCenter Server Appliance via CLI