I suggest you allow you router to do DHCP and check the DHCP client list to see if the DPR-1260 is picking up an IP, after you access the DPR-1260 you can set an static IP address on the DPR-1260 and disable again DHCP.
Also, the first version (1.00) is not DHCP, so there's a very small chance this is the case.
Good luck.