How to change router IP address

Basically I'm trying to use an old router to set up a guest WiFi network. Following advice on the Internet I first changed the old router IP address to (main router IP is

For some reason, after I changed the router IP I can't connect to the router. This is just with my PC connected directly to the old router and typing into the browser. I restarted the router and the PC but still can't connect. The only way I can get back into the router is to restore factory defaults. I tried several times with different IP addresses, the only one that worked was I don't really want to use that as I want to use a different range to my main router. Can anyone tell me where I'm going wrong?
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  1. Best answer
    Should have changed it to not 2.1 You have it on a different subnet now so you won't be able to connect to it. The only way would be to manually set your PC to like, etc, connect to it, switch back, etc, etc.
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