If the firmware on the switch hasn’t been updated to not function with old versions of the app why not just snag an old APK and use the old app version?
At least as long as you own the thing, worth a shot
It’s… really not that hard.
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Uninstall the new app, download the old app from https://www.apkmirror.com/ (which is basically an archive of most apps downloadable from Google Play).
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Use an app like APK signer to change the app’s “signature” so it doesn’t automatically update.
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Install it.
It takes like 10 minutes at most.
I did exactly this with the Discord app last year when they suddenly changed the app’s entire layout.
I do believe it was. It was a TP Link smart switch and it routinely needed updates or else it wouldn’t work. The app was finicky as hell before and I don’t really care anymore for it since it’s main use was to turn on the bedroom lights automatically. But now I work 2nd shift so the sun is up anyway when I wake up. It works as a normal switch now.