Can't restore VMhost config

Morning,

So I'm trying to do the set-vmhostfirmware but doing it to the same 6.5 but a different revision. I'm getting the following error

PS C:\WINDOWS\system32> Set-VMHostFirmware -SourcePath C:\temp\Backup\configBundle-10.1.9.27.tgz
Set-VMHostFirmware : 30/08/2018 09:45:26      Set-VMHostFirmware            A general system error occurred: Internal error      
At line:1 char:1
+ Set-VMHostFirmware -SourcePath C:\temp\Backup\configBundle-10.1.9.27. ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Set-VMHostFirmware], SystemError
    + FullyQualifiedErrorId : Client20_SystemManagementServiceImpl_RestoreVmHostFirmware_ViError,VMware.VimAutomation.ViCore.Cmdlets.Commands.Host.SetVMHostFirmware

Any ideas?
LVL 17
Alex Green3rd Line Server SupportAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Restores must be to the same build and version of ESXi, not different - that is not supported.

So a backup from ESXi 6.5 build xxxxxx, must be restored to ESXi 6.5 build xxxxxx.

if you restore to ESXi 6.5 build xxxxxy - this is not supported.
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Alex Green3rd Line Server SupportAuthor Commented:
Awesome, so there isn't any way around that?
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Alex Green3rd Line Server SupportAuthor Commented:
Shame this isn't possible but clear answer as always, thank you :D
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
It's not supported, you can restore state files manually, but you run the risk, if there are code changes between ESXi builds, you can have unpredictable results.

The best thing is to document the build you have, and also make sure you have the patches, iso to install and then restore.
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