Samsung has released firmware updates for the NX1 and the NX500, bringing the NX1 up to firmware version 1.41 and the NX500 to firmware version 1.12.
Both updates fix a Bluetooth issue that arises when pairing the cameras with smartphones running Android 6.0 Marshmallow. The NX500 update changelog advises users to update the camera firmware together with the Samsung Camera Manager App.
Samsung NX1 Firmware: Download
Samsung NX500 Firmware: Download