Hi, I would like to upgrade my iMac 2011 EMC 2429 to bluetooth 4.0. The card installed in the iMac is the BCM92046MD. Is there a compatible BT 4.0 card I could buy and install? Please help if you can... All the best, Tom PS.: I have upgraded my 2011 MacBook Pro with a BT 4.0 chipset and everything works.