HOW TO: Upgrade VMware ESXi 5.5 to ESXi 6.0 in 5 easy steps

https://www.experts-exchange.com/articles/18819/HOW-TO-Upgrade-VMware-ESXi-5-5-to-ESXi-6-0-in-5-easy-steps.html

How to upgrade to VMware ESX 4.1 or VMware ESXi 4.1 using esxupdate

Watch the video here:

or download it from here.