This firmware cannot be included in the official release because it violates Debian's Social Contract and it will not be installed automatically even if the unofficial non-free ISO image is used.
To solve this problem disable the graphical desktop by pressing "e" with the Debian boot menu entry highlighted and add this to the end of the line that starts with "linux":
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systemd.unit=multi-user.target
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# apt install firmware-linux-nonfree
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# apt edit-sources
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# apt update
See also https://wiki.debian.org/SourcesList#Component & https://wiki.debian.org/Firmware