Hikvision / Swann NVR upgrade number of cameras

is there a way to upgrade the number of cameras a Hikvision 7600 series NVR will support?

I have a Swann 7090, and I recently upgrades it to the latest Hikvision firmware... all the ports on back are in use, but I have an ONVIF camera from Digital Watchdog on my LAN that i've been screwing around with...

the NVR can see the camera, but i get a 'no more ip cameras allowed' message when i try to add it.

is there a way i can change a jumper or use a different firmware to make this a 16 channel NVR?

No.