Time to give up on Airport Base Station/Airport Utility?
I have an Airport Extreme Base Station (yes, I know they were discontinued some years back), and it still works as a wireless router and as a backup drive, but AirPort Utility hasn't worked correctly in probably four years, at least. I've tried all kinds of things, but in the end, it doesn't seem to help.
Now I'm at a point where I want to change the password for my guest network, but the AirPort Utility on my MacMini just doesn't function correctly. It may show the base station (and sometimes not), but then tells me it it isn't connected (but my wi-fi is functioning perfectly and back-ups still take place.)
Accessing my Airport Utility on my mobile devices isn't working any better. The first time I accessed it on my iPhone 12 (iOS 15), it showed up, but then asked me for the device password. (I'm assuming the base station's password.) I entered what I thought was the password, but it didn't work. I tried several others, but nothing worked. Now it's not showing up at all, even after I force-quit and reopen it.
Because AirPort Utility on my desktop (MacMini) doesn't even recognize the base station, choosing "Show Passwords" from the menu is pointless, as it is grayed out. I'm not sure how I might find this in my keychain, as I do not know what I am searching for.
So, should I just give up on this router because the software doesn't work and doesn't seem to be supported anymore? Do I have other options besides buying a new (non-Apple) router, so that I will have functioning software?
TIA for any advice or suggestions.