Media Player not working after server update

[Deepee]

In a browser, go to your Jellyfin and then Dashboard > Devices.  Delete the session for Jellyfin Media Player.

On the system with JMP, go to C:\Users\yourUser\appdata\local.  There will be a folder called "jellyfinmediaplayer" and "Jellyfin Media Player".  Delete both.

Open JMP and log back in.

Do you know how one would do this on a Firestick? I tried deleting cache and data, before and after reinstalling, bur I can't locate the JMP folder to completely remove.