This article to is provide steps on how to convert vLCM from baseline to image based updates in clusters manually through vCenter directly instead of through SDDC or Powershell script like below articles:
Attention: Ensure to have valid snapshots/backups completed of vCenter Server and SDDC Manager prior to applying steps. Keep in mind that, if vCenter Server is part of an Enhanced Linked Mode (ELM) replication setup, offline snapshots of all vCenter Servers in the replication setup are required. Refer to vCenter Server Appliance Data Integrity Best Practices for more information.
# psql -U postgres -h localhost\c platformselect * from cluster;update cluster set is_image_based='t' where name='<cluster_name>';\q