Lorex 4KHDIP168i 16 Channel Security System w/ 8 8MP LNB9232S 4K Fixed Lens 8MP 30FPS Audio Bullet Cameras

Cameras Quality is good. Customer Service 100% terrible. All cameras say invalid username and pasword while im logged into the system. They said because the IP address have changed and the DVR cant communicate to the cameras. Theysaid they are not able to fix it so im trying to tech it out myself.