Librem 14 laptop

From what I understand, their Magician software only runs under Windows. It’s more of a convenience app for easy handling of the firmware update. I did not use it (no M$FT on my premises) but I think what it does is choosing the right firmware for the model to be updated, then fetching the .iso and burning it into a USB stick that will actually do the flashing when booted.
I didn’t check what those .iso images really are - because there was no fwup for my model anyway - but they seem to be either a Linux initrd image (which you can extract the updater from) or a FreeDos image for older SSD models (more complicated to extract their fumagician updater, though); at least that’s what the instructions given from Solid state drive - ArchWiki would imply.

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