So, Cisco (disclaimer: I work at Cisco, although not in the group working on the NSSxxx products) has recently decided to stop selling their Qnap OEM’d NAS devices. See the link here. For those of us who have one of these in our labs (I have a NSS326 myself), this means no more firmware updates from Cisco. But, the latest firmware for these devices from Cisco (version 1.5, Release Notes PDF here) does allow for users to migrate from Cisco firmware to the stock Qnap firmware.