Esxi upgrade from ver5.1 to 6.1

What is the preferred method of upgrading exi5.1 to ver 6.0?
Here is what I did and does not seem to be working to me !!
I disconnected the esxi host5.1 from vcenter and removed it.
Booted the esxi with ver6.0 Iso image. Then I selected the option to wipe and install as clean . The last option in the list,everything was installed and rebooted.
I now can not ssh using putty or connect to desktop client.
I see that lock down mode is grayed out,
I can only use the direct console to log on

Tried alr+f1 to access she'll and cursor is blinking,not able to issue any command.
Can I upgrade from 5.1 to 6?
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sara2000Asked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Personally we would install a new version of 6.0 and patch.

But becareful if using HP servers because there is a serious fault with drivers.

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sara2000Author Commented:
I am going to replace the disk and install 6.0
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