How to boot an External SSD from a cd/usb?

Does anyone know how I can boot an external SSD from a cd/usb? i need to update the firmware on the SSD via a cd/usb before i put it in my mac as the update is listed as a destructive update (meaning it will require re installing a back up). But i am unsure how to do this or if it is even possible on a mac? It would save me the hassle of putting the SSD in my mac updating and removing again if it is critical.
Any help would be greatly appreciated, many thanks.

You cannot boot from the CD unless it has the OS on it. For reasons unrelated to this post I just created a bootable external HDD and installed some software on it from a CD. I think you have to do the same procedure with your firmware.
Attach the external SSD to your MBP.
Power the MBP holding the OPTION key.
Select the external SSD.
When the system is ready, insert the CD.
Do your firmware update.
Shut down the MBP and swap the drives.
This is based on the premise that the external HDD has an OS on it.
As far as the 'destructive update' aspect is concerned, I leave that to Clinton to pursue. I'm still 'old fashioned' and use only HDDs. Clinton has the SSD knowledge base.
Trust me, both Clinton and I are here to help you as much as we possibly can. When I said,
"Am I missing something here?", it was not a challenge but a need for more information and/or clarification. This medium has its limits in communications.
Ciao.

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