Downgrading VM hardware version 8 to version 7

Make sure you have a good backup of the VM
Power off the VM
Make sure the VM doesn’t have any snapshots before proceeding
From the ESX console or from a Putty session, edit the VMs VMX file, using your favorite editor
vi /vmfs/volume/Datastore/srv-1/srv-1.vmx

Change the virtual hardware version from:
virtualHW.version = “8”
to
virtualHW.version = “7”

Change the virtual hardware version from:
ddb.virtualHWVersion = “8”
to
ddb.virtualHWVersion = “7”

You should now be able to power on the VM as virtual hardware version 7.

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