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It is possible, ESXi installer upgrades have a rollback feature.<br />
<br />
At ESXi BOOT, Press Shift-R together this will pop up a warning about rolling back, and list the version you can roll back to...<br />
<br />
Press Shift-Y, and it will roll back to a previous version.<br />
<br />
see also here this KB Article to support this<br />
<br />
<a href="http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1033604" rel="ugc nofollow">http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1033604</a>
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It is possible, ESXi installer upgrades have a rollback feature.

At ESXi BOOT, Press Shift-R together this will pop up a warning about rolling back, and list the version you can roll back to...

Press Shift-Y, and it will roll back to a previous version.

see also here this KB Article to support this

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1033604 [http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1033604]

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I will test it out after hours and let you know.<br />
<br />
Ben
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I will test it out after hours and let you know.

Ben

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I would encourage you to always have a full backup (not snapshot) of VMs, before any production change.
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I would encourage you to always have a full backup (not snapshot) of VMs, before any production change.

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I dont suppose you have the steps/link to do a full backup in ESXi 6?<br />
<br />
Again, I really appreciate all the help you have given myself and everyone here on EE.
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I dont suppose you have the steps/link to do a full backup in ESXi 6?

Again, I really appreciate all the help you have given myself and everyone here on EE.

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Oops, I typed too fast. I meant to type &quot;full backup of VMs&quot;.
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Oops, I typed too fast. I meant to type "full backup of VMs".

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see my EE Articles, and as a last resort...VMware Converter or...<br />
<br />
<a href="https://www.experts-exchange.com/Software/VMWare/A_12373.html" rel="ugc">Part 10: HOW TO: Backup (Export) and Restore (Import) virtual machines to VMware vSphere Hypervisor 5.1 for FREE</a>
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see my EE Articles, and as a last resort...VMware Converter or...

Part 10: HOW TO: Backup (Export) and Restore (Import) virtual machines to VMware vSphere Hypervisor 5.1 for FREE [https://www.experts-exchange.com/Software/VMWare/A_12373.html]

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<div class="content wysiwyg-content">
I want to roll-back from VMware ESXi 6.0 to version 5.5 - Is this a possibility and still able to keep the VM's intact?<br />
<br />
If possible I dont want to lose any VM's, etc.<br />
<br />
Thank you,<br />
HappT
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</div>


I want to roll-back from VMware ESXi 6.0 to version 5.5 - Is this a possibility and still able to keep the VM's intact?

If possible I dont want to lose any VM's, etc.

Thank you,
HappT

I want to roll-back from VMware ESXi 6.0 to version 5.5 - Is this a possibility and still able to keep the VM's intact?

VMware, a software company founded in 1998,  was one of the first commercially successful companies to offer x86 virtualization. The storage company EMC purchased VMware in 1994. Dell Technologies acquired EMC in 2016. VMware’s parent company is now Dell Technologies.

VMware has many software products that run on desktops, Microsoft Windows, Linux, and macOS, which allows the virtualizing of the x86 architecture.  Its enterprise software hypervisor for servers, VMware vSphere Hypervisor (ESXi), is a bare-metal hypervisor that runs directly on the server hardware and does not require an additional underlying operating system.

VMware

Citrix is the synonym for the virtualization and application infrastructure systems developed by the company of the same name. Main areas are application virtualization, Software-As-A-Service (SaaS), cloud-computing and networking. The two most well-known are Citrix XenApp or Citrix CloudPlatform.

Citrix

Hyper-V is a native hypervisor; it can create virtual machines on x86-64 systems and supersedes Windows Virtual PC as the hardware virtualization component of the client editions of Windows NT. A server computer running Hyper-V can be configured to expose individual virtual machines to one or more networks. Hyper-V Server supports remote access via Remote Desktop Connection. Administration and configuration of the host OS and the guest virtual machines is generally done over the network.