Change Boot Sequence with new Extensiondata option

Hello PowerCLI masters,

I'm attempting to change the boot order for a VM (or a bunch of VMs) with the new Extensiondata.Config.Bootoptions.  Easy enough to edit these values but i'm having some issues determining what the values shoudl be.  I've tried some of the values we used to use and it's failing to take the change.

$vm.Extensiondata.Config.Bootoptions.BootOrder = "Ethernet0"

$vm.Extensiondata.Config.Bootoptions.BootOrder = "Ethernet0,ide0:0"

etc.

Can someone provide some guidance on how to make the appropriate changes?

Thanks!

Brent