This method apply to upgrade Dell ESXI server 6.7 U1 to U3
Go to Dell vmware esxi u3 patch download page https://www.dell.com/support/home/en-ca/drivers/driversdetails?driverid=j75ny
Download VMware-VMvisor-Installer-6.7.0.update03-14320388.x86_64-DellEMC_Customized-A02.zip file and upload in to your ESXI datastore.
Put the host to maintenance mode.
Then ssh into esxi host via putty and run this command
esxcli software vib install -d /vmfs/volumes/Store1/updates/VMware-VMvisor-Installer-6.7.0.update03-14320388.x86_64-DellEMC_Customized-A02.zip
make sure to to change store location and zip file name as per your environment.
After the completion, reboot the esxi
Done!!
NetSideTech 