How to reset vCenter Server 6.5 alarms definitions?

Hi all,

We have a test vCenter server 6.5 appliance with a lot of custom alarms definitions. Is there a way to reset all those alarms to their default values? I found the following article but it doesn't apply to vSphere 6.0 and above:

     VMware Knowledge Base

I tested it but my vCenter was then unable to start anymore with an error message in vpxd.log:

     [Originator@6876 sub=alarmMo opID=CreatePredefinedAlarms-bc5816b] Upgrade from pre VC5.0 version not supported in VC 6X

Is there any solution?

Many thanks for your help! :-)

Franck