Will,
You can see the firmware whitelist here:
repos/pc/src/lib/wifi/firmware.cc.
It seems to request firmware that isn’t on the list.
Presumably this means your wifi card is a slightly different
model from others, but it might still work with the firmware.
If you are building Sculpt from source (there are instructions
for it on the sculpt page), you can probably
1) Find the referenced file in your Linux system
(if you have Linux installed).
cp $(REP_DIR)/recipes/raw/wifi_firmware/*.ucode .
in the ucode_files recipe.
3) Modify the firmware.cc file to add the
ucode you need along with its size.
Hopefully that helps?