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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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VMware ESXi has 2 bootbanks; with some luck the second contains your old ESXi version

Posted by jpluimers on 2021/10/19

Just in case I ever need this again:

  • [Wayback] VMware Knowledge Base: Reverting to a previous version of ESXi (1033604)
    1. In the console screen of the ESXi host, press Ctrl+Alt+F2 to see the Direct Console User Interface (DCUI) screen.
    2. Press F12 to view the shutdown options for the ESXi host.
    3. Press F11 to reboot.
    4. When the Hypervisor progress bar starts loading, press Shift+R. You will see the warning:
      Current hypervisor will permanently be replaced
      with build: X.X.X-XXXXXX. Are you sure? [y/n]
    5. Press Y to roll back the build.
    6. Press Enter to boot.
  • [Wayback] Downgrade ESXi 6.5 from update 3 to update 2 – VMware Technology Network VMTN; when out of luck:
    • This is not my case.As I mentioned, I don’t have altbootbank with update 2. This is because after update 3, I also installed the latest patch.So both bootbanks now have update 3.Is there any other option for me. Can I just install update 2 again so it will overwrite everything? Or it is impossible?
    • Backup ESXi configurations and reinstall it without overwriting VMFS.

Via: [Wayback/Archive.is] downgrade esxi 6.5 u3 to u2 – Google Search

–jeroen

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