How to move cameras from old NVR to New NVR?

Hey guys.

I just bought a new nvr.

The old one has built in POE but the new one i've had to buy a seperate switch.

So far, i've opened SADP and clicked unbind on the old NVR.
Then i plugged in the new NVR and all the old cameras.

I have turned on the new NVR and it doesn't display any cameras in both the NVR or SADP. (I set a password at the start but it still doesn't pickup the old cameras, new cameras work fine)

Why is this?

Any help would be greatly appreciated

Thank you