Comment 1 for bug 110590

That's all fine and dandy, and to be honest, I would have switched us over a year ago to rt2x00, except that the two machines I have with rt2500 cards in them do not work with rt2x00, only with the rt2500 legacy driver.

If they fix that, then I'll feel comfortable making the move.

In addition, reality is, we already have the modules:

echo blacklist rt2500 | sudo tee /etc/modprobe.d/rt2500-blacklist
echo rt2500pci | sudo tee /etc/modules

After rebooting, you should be using the rt2x00 version of the driver, although I cannot confirm it works.