Home internet and wi-fi extender

If the Wavlink wifi extender will allow you to do a manual IP address change and save you could provide it with an IP address in the 192.168.12.X/24 subnet. The DHCP scope established on the Nokia, as far as I have been able to determine, appears to run from 101-254. You can safely use an IP address below 101 and not have a conflict with other clients. Of course you have to also exclude the 192.168.12.1 gateway address but that is pretty obvious. 

I did a brief search on the web for the extender. One customer review seemed to suggest using it in bridge mode but with that extender then it would be connected with an Ethernet cable. If you are concerned about getting updates to the extender using it in the bridge/AP mode to do so might resolve that. I did not look deep enough to find out if they allow the alteration of the IP address in repeater mode. The YouTube video only covers the use of the wizard. There is the setup gear on the main menu you can check and see if it allows the additional configuration options. The comments from users below the video did not seem to make it that impressive. You can always go to their support site and see if Wavlink support can provide clarification.