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
• VMware vCenter Server 7.0
• VMware vCenter Server 8.0

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

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• An outdated (lower) version of the vCenter Server patch, which is lower than both the required target version and the currently installed vCenter Server version, was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