For a lot of iSCSI/NAS systems we have launched a new firmware with fixed bugs, new features and optimized GUI. To upgrade the systems a firmware version 3.x must be installed before. A new manual (v5) is available too.
Models to run with new firmware: NDL-2400R, NDL-2550T, NDL-2700T, NDL-2700ST, NDL-2700SR, NDL-2800R, NDL-2800SR and NDL-2800R+
Update is only possible if there is v3.x installed on your NAS.