Changed Ip address, now no access

Due to getting a new router from my ISP, I changed the static IP address on my NAS server from 192,168.0.42 to 192.168.1.42, then saved it. Now I can’t get to my server because both IP address are not recognised., and nor is it showing on my network.
I connected the NAS server direct to my computer, but I still can’t get to the UI with either IP addresses.
Is there any other way to find out what the IP address of the NAS server is. I did try AngryIP scanner but it didn’t find anything.

Thanks

Attach a monitor and keyboard to the server.
The IP will show up at the menu.

You also have the option to change network settings there.

Don’t reset the entire configuration, at least not at this point.

Thanks, and why didn’t I think of that, doh!. Mind it was 10 years ago since I last did that.