You need to update the firmware to v3.4.62 which can be downloaded from http://www.laviewsecurity.com/files/firmware/NVR%20LV-N9808C8E%20v3.4.62%2020160802.rar
See official site http://www.laviewsecurity.com/cms/support_alert_feed/new-firmware-released-for-8-channel-nvrs/