Can't find my book live

Look at your router’s DHCP client table. Find what IP address your router has given your MBL.  Is the MBL listed there? If not, then i would bet that your MBL has a static IP which is not within the range of IPs your router can assign.  To fix this, plug in your old router to the MBL, look up the DHCP table, get the IP of your MBL, then http://ipaddress/UI/  then in the Dashboard go to Network and change it to Dynamic IP. When done, you can connect to your new router and see if your new router assigns an IP address to the MBL (look at DHCP table).  if so, then http://ipaddress/UI.