Originally posted by Tomin
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It's of course supported by Windows https://docs.microsoft.com/en-us/win...pdate-platform
and there is also a Linux project with tools and its own firmware repository https://fwupd.org/
If you get your hands on the capsule blob (a *.cab file) you can manually "install" it with the Linux commandline tool. (more like send it to the UEFI and let it do its thing, which is the same on any OS).
Since this is a standardized UEFI system and not a custom BIOS flashing tool it is less likely to blow up (as any upstream bug will affect anyone, and will be cached fast).
My Lenovo laptop from 2015 supports it if I check from Linux, and I'm pretty sure the windows-only "firmware upgrade" tool is actually using capsules.
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