Upgrade VMware ESXi v4.1 to V5.1 and preserver VMFS Datastore

I was told that upgrading a newer version is s simple process, however, I just began a n upgrade and I'm confused on whether I should proceed. I'm at the Step: ESXi and VMFS Found & it provides 3 Options, and Option 1 has an (X) as if its the default/correct choice.
(X)  Force Migrate ESXI, preserve VMFS datastore
(  ) Install ESXi, preserve VMFS datastore
(  ) Install ESXi, overwrite  VMFS datastore

I'm certain that it is not option 3 as my objective is to preserve the existing datastore with the guest operating systems, however,
when I choose option 1, it presents the following an error message:
"Custom VIB's Warning
Your system encountered following warnings during prechecks.
<3RD_PARTY_SOFTWARE_WARNING: Host contains third-party
VIB(s) that have not substitute on the ISO.

The current host system is an HP ML350g6 & is functioning fine on ESXi VMware v4.1 and it was suggested that we upgrade
to a newer version for this host system.

Basically, I just want to know if I should proceed or backout (if possible) and leave the system as is?

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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You will always want to use the PRESERVE option, to ensure that the VMFS datastore which contains your VMs, is not overwritten.

Why was it suggested you upgrade, if everything works for you.....

Okay, so 4.1 is End of Life, and you may not be entitled to support, but ESXi 5.5 and 6.0 are much later versions....

BUT before you apply any upgrades, you should check if your HP servrer is on the HCL

Check the VMware Hardware Compatability Lists HCL here

The VMware Hardware Compatibility List is the detailed lists showing actual vendor devices that are either physically tested or are similar to the devices tested by VMware or VMware partners. Items on the list are tested with VMware products and are known to operate correctly.Devices which are not on the list may function, but will not be supported by VMware.


But back to your issue, about the forced upgrade, this is the option which should be chosen, BUT before you do it, did you make sure you downloaded the OEM HP version of ESXi.

which is what you should be using for an HP server.

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ECSI06Author Commented:
My primary reason to upgrade this client from v4.1 to v5.X is that they are currently running the FREE version of ESXi v4.1... which is not recommend for a production environment and does not include an API's that allow Veeam to capture backups or snapshots for disaster recovery. I reviewed the HCL and it appears that the HP ML350g6 is certified up to v5.5U2. Thanks for advising me on the OEM HP version of VMware as I was not familiar with this option. I will attempt another upgrade during the evening hours later this week and let you know how everything progresses.
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