Error "The attached ISO file does not support upgrades from the current vCenter Server version" Reduced Downtime Upgrade (RDU) - vCenter

Products

• VMware vCenter Server

Issue/Introduction

When performing a Reduced Downtime Upgrade (RDU) in vCenter Server 8.0 Update 3, you encounter the following message in the vSphere Client:

• "The attached ISO file does not support upgrades from the current vCenter Server version. Attach a different ISO file and try again."
• The UI may incorrectly suggest that a downgrade is required or show the current build as newer than the one on the ISO.
• The upgrade process through the Lifecycle Manager / RDU plugin fails to proceed.
  
  

Environment

• VMware vCenter Server 8.0 Update 3
• Feature: Reduced Downtime Upgrade (RDU)

Cause

This error occurs because the Reduced Downtime Upgrade workflow is designed for major/minor version transitions using the Full VCSA Installer ISO.

If you mount a Full Patch ISO (-FP.iso) (e.g., for build 8.0.3k), the RDU mechanism does not recognize it as a valid upgrade image. The RDU plugin is specifically looking for the manifest files present in the full installer, whereas the VAMI (port 5480) is the intended interface for applying -FP.iso patches.

Resolution

To resolve this issue, use the traditional VAMI update method which is compatible with patch-level ISOs:

1. Take a file-based backup and an offline snapshot of the vCenter Server VM.
2. Ensure the Full Patch ISO (-FP.iso) is mounted to the vCenter VM's CD-ROM drive.
3. Access the vCenter Server Appliance Management Interface (VAMI) at https://<vcenter-ip-or-fqdn>:5480.
4. Log in as root.
5. Navigate to Update > CHECK UPDATES > Check CD ROM.
6. Select the detected patch and click Stage and Install.

Note: If you intended to use the Reduced Downtime feature, you must download the Full VCSA Installer ISO (not the patch ISO) from the Broadcom Support Portal, provided the target version supports RDU for your current path.

Additional Information

• For a list of supported RDU upgrade paths, refer to vCenter Server upgrades with the reduced downtime.
• For troubleshooting general VAMI ISO detection issues, see Unable to patch vCenter server from VAMI.