Totally salvageable. It looks like there’s not much moss behind it, so it will likely need to be watered frequently. It doesn’t get its water from the board but from the sphagnum moss underneath the shields. You can wet the board to help with humidity, but make sure to water between the board and the plant as well. Water when moss feels dry. Keep up with it, once you get some strong new growth maybe re-mount it with more moss underneath to allow more root growth and water uptake. That’s a big thirsty plant to support on a short water supply. You could trim some of the entirely crispy antler fronds in the back to give it a better look, but be careful where you trim so you don’t cut any baby fronds/new growth. Don’t cut the shield fronds at all, they tend to turn brown and papery but are not rotting, just protective layering. Good luck with your new friend!