How to upgrade ESXI to ESXI 6.0

How to upgrade ESXI to ESXI 6.0

1. Disconnect the network storage
2. Do not disconnect a LUN that contains an existing ESXI installation.
3. Set the server hardware clock to UTC in BIOS.
4. Boot the ESXI installer from a cd, DVD or USB.
5. Select the drive on which to install or upgrade ESXI and press enter in the select a disk panel.
6. Press F1 for information about the selected disk.
7. Upgrade ESXI if the installer finds an existing ESXI installation and VMFS datastore.
8. Press F11 to confirm and start the upgrade.
9. Remove the installation cd or DVD or USB flash drive when the upgrade is complete.
10. Press enter to reboot the host.
11. Set the first boot device to be the drive which you selected previously when you upgraded ESXI.
12. Connect back the network storage.

Source: Methods for upgrading to VMware ESXi 6.0 (2109711) | VMware KB

http://pubs.vmware.com/vsphere-60/index.jsp?topic=%2Fcom.vmware.vsphere.upgrade.doc%2FGUID-77D42D81-F47E-4FE9-B4B2-B15AB16C9C1A.html