After upgrading to ICS, two of the four bluetooth devices I use would not pair. Both devices appeared under "Available devices" (All four devices worked before system update.) When I attempted to pair I got the message "Unable to pair with [device name]. Incorrect PIN or password. I turned off bluetooth, went to settings --> applications --> all and cleared the cache for Bluetooth Share and Bluetooth Test. I restarted the phone and turned bluetooth on. After scanning for available devices, each device shows up. One of the two devices -- Motorola S10-HD headset -- then paired successfully. The other device -- H800 Logitech Headset -- continues to generate the "Incorrect PIN or password" error message. Is there another trick that might get the phone to pair with this device?