Atheros Ar5b22 Driver -

Handoff, AirDrop, and Continuity will not work with the AR5B22 because it lacks Apple’s Broadcom-specific Bluetooth/Wi-Fi combo chip. However, standard Wi-Fi and Bluetooth audio work perfectly.

Point it to the folder where you unzipped your downloaded driver files. Ensure "Include subfolders" is checked. atheros ar5b22 driver