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You can try something like this

foreach($esxcli in Get-VMHost | Get-EsxCli -V2){
    $esxcli.hardware.platform.get.Invoke() |
    Select @{N='VMHost';E={$esxcli.VMHost.Name}},VendorName,ProductName,SerialNumber,
        @{N="BIOS version";E={$esxcli.VMHost.ExtensionData.Hardware.BiosInfo.BiosVersion}},
        @{N="BIOS date";E={$esxcli.VMHost.ExtensionData.Hardware.BiosInfo.releaseDate}}
}