You can get the old Dashboard’s running using the Proto stealth server, after the plugin is loaded in DashLaunch you can just launch the .xex file of the old dash and it should work, and if you want it by default you can set your Xbox to launch it by default with DashLaunch.

I wish I could link you a proper write-up but I haven’t found one, just stuff scattered around random YT vids and Discord.
Also, no clue if DashLaunch works with Bad Update, be careful.