1) Enable SSH

2) Upload the ZIP-File to the any datastore

3) Set all machines to maintanace-mode or shutdown them, only host is active

4) esxcli software sources profile list -d /vmfs/volumes/<datastore>/<path>/VMware-VMvisor-Installer-6.7.0.update02-13644319.x86_64-DellEMC_Customized-A01.zip (last one is the zip-filename)

5) esxcli software profile update -d /vmfs/volumes/<datastore>/<path>/VMware-VMvisor-Installer-6.7.0.update02-13644319.x86_64-DellEMC_Customized-A01.zip -p DellEMC-ESXi-6.7U2-1 (last item = profile name from prior step)

6) WAIT - takes some minutes without any response!

7) reboot