I copied the SD image given by Wolfson to run the audio card and it worked very good. Because of my project (using mysql connections) I had to update and upgrade my raspbian, and then I cannot record or play any file. I know that Wolfson and Element 14 had to hack the normal raspbian version, and I suppose that upgrading it restores the hacked files, so how can I make it work again (without rewritting the SD card)?