Why do I get 'SIOCSIFFLAGS : No such file or directory' error message

Some drivers require a firmware to be loaded (b43, prism54, zd1211rw, …). The driver typically loads the firmware itself when started.
In this case, the driver didn't find it because the firmware was not in the right place or is missing from the computer. To find the firmware's correct location, read the driver documentation.

Compiling your own kernel isn't that hard. There's lots of documentation available online. Problem is, I think it's a beyond Scorps right now. The other problem (the main one) is, 4 out of 5 times I've incorporated bcm restricted blobs into my own self-compiled kernel, the wireless didn't still work. The new open source drivers from Broadcom might give me more cause for optimism, but I'll wait for a couple more version checks before I attempt incorporating it.