If this point was not clear, let me help change that here.
It's either (blacklist the b43 driver)
blacklist=bcma,ssb,b43 AND use only the wl-modules-3.8.10-tinycore.tcz extension
OR
if compatible (see post #14)
use the built in b43 driver (ie no blacklist) and use the cutter to extract the required firmware as described in the linuxwireless.org drivers, see b43-fwcutter.tcz extension and it's info file.
Or maybe there is a chance that using firmware-broadcom_bcm43xx.tcz extension may provide the necessary firmware (it's really hard to know for sure without the wireless device to test with).