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Debian 9 bluetooth fails worked on Debian 8 (firmware) bluetooth hci0: firmware: failed to load brcm/BCM20702A1-0b05-17cf.hcd

I copied firmware from Deb8 to Deb9; however, the file name needed to
change from BCM20702A1-0b05-17cf.hcd to BCM20702A0-0b05-17cf.hcd, so
when I copied the file, it still didn't work.  It took a while to see
that the file mentioned in dmesg >>really<< wasn't present.

Don't let it happen to you.