Checking the current iwn(4) firmware version and upgrading it

[R. Tyler Croy]

I'm rather familiar with the FreeBSD source code and buildworld process, but I
don't have a good idea of where binary blobs for chipset firmwares are kept.

Is there a document I missed in the handbook or on the wiki which details where
the firmware comes from and how one might be able to experiment with later
versions?

Cheers
- R. Tyler Croy
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