Apple TV reset without working remote

When your original remote is physically broken, you will need to get a replacement remote, and pair that. For the Apple TV A1625 or later, that would be a Siri Remote.

The software remote on iPhone won’t be useful until you have entered the network information (using a functional remote).

Replace your Apple TV remote - If you lost your Apple TV remote - Apple Support

If your Siri Remote or Apple TV remote isn't working - Apple Support

Apple TV remote models and their compatibility - Apple Support

When I first set up my Apple TV it also gave me a remote on my Apple X iPhone under the Control Panel although I've never used it, it's an idea. So give it a go. If you don't know what your iPhone's Control Panel is, you get it by dragging down from the top right corner of any main screen. The attached photo shows my Apple TV remote at the bottom of my Control Panel. If the remote is not already in your Control Panel, go to Settings > Control Centre and see if you can add it.

There are also Apps you can download from the App Store to control your Apple TV from your iPhone.