You are going to need to spend a little time learning about networking. All these devices run on TCP/IP and if you have no working knowledge, it's going to be difficult for you to try and figure out what's going on. Try pulling out the amplifi and go back to your original router. If everything starts working again, take note of every IP address for every PC, camera and NVR. Then, put the Amplifi back in and take note of the iP addresses and verify that the addresses are not different. If they are, you may need to revert back to the original router, access each camera and the NVR to adjust the IP address to reflect what the Amplifi is using before putting the Amplifi back in-line. Hopefully this makes sense to you.