Hi there
When installing Sparky from the live DVD, I had to connect my laptop directly to my modem. My wifi device is "Broadcom Corporation BCM43225 802.11b/g/n (rev 01)", running on my 64 bit Acer Aspire 5745G laptop, at the time Sparky 4.1, kernel 4.1, now Sparky 4.2 with kernel 4.2.0-1-amd64, and the packages for it to run were installed such as b43-fwcutter, firmware-b43-installer and firmware-b43legacy-installer.
The problem I discovered after installation was that the wrong module, namely "b43" was blacklisted. The module that needed to be blacklisted was the "wl" module. Then when I enabled/unblacklisted b43 along with all the other modules previously blacklisted in /etc/modprobe.d/broadcom-sta-common.conf such as brcmsmac, ssb, cordic, mac80211, cfg80211 it works. :)
Cheers