Hi! So my predicament is that my security cameras dont have a brand that I can see, and they are already installed to my home and they use PoE switches to be powered. Long ago I once had access to it but that was through an app on my old phone, now I have a new phone. The app was ivms-4500. The issue is, I have no idea how to connect the camera to the app. It asks me for a qr code but I have no box or DVr to do so, so I dont know what to do? Any suggestions. I dont know what camera it is or was. My friend gave me his old security cameras and installed them, and connected them to the app. That's all the information I have. Any suggestions to connect these cameras? Please?