I have a laptop vaio duo 13 which has a broadcom 43241 wireless card. My problem is similar to this one Broadcom Wi-Fi Adapter not recognized .
I tried to install the driver brcmfmac(SDIO) here http://wireless.kernel.org/en/users/Drivers/brcm80211 and copied the nvram to /lib/firmware/brcm as the page tells, but this didn't work.
Most questions I searched are about br43 such as Installing Broadcom Wireless Drivers . I tried part of solution like unblock all in rfkill, put an # in front of blacklist bcm43xx, but none worked. I didn't uninstall or install any drivers such as b43-installer, b43legacy-installer, bcmwl-kernel-source (only tried b43-fwcutter) because they are not compatible with bcm43241.
Above is all information I can provide for help. Thanks.