I was not able to use flashrom with Intel C236 motherboard Fujitsu D3417-B1,
as the following information was displayed, I'm also attaching log.
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Found chipset "Intel C236" with PCI ID 8086:a149.
This chipset is marked as untested. If you are using an up-to-date version
of flashrom *and* were (not) able to successfully update your firmware with it,
then please email a report to flashrom@flashrom.org including a verbose (-V) log.
Thank you!
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I'd purchase another C236 or C232 motherboard, would welcome suggestion which one to try.

Best regards