You must manually upgrade from the ESXi 6.5 GA to ESXi 6.5 U1 version.

Prerequisites

Verify that the upgrade is successfully complete. See Verify the Upgrade.

Procedure

  1. Apply the later version of a full image profile onto the host.
    esxcli software profile
    update <build> -standard --allow-downgrades --no-sig-check
  2. Reboot the ESXi host.

    reboot