FoB stop working

I have a Toyota Prius 2008 and my key fob has stopped opening and closing the doors. fob but does not open or start the car from a distance or close by.
When I put the new battery into the fob, the red light doesn't turn on it doesn't flash when I press any of the three keys. I put the fob in and car doesn't start either.

Everything were working fine yesterday, only thing I did was changed the new case for the FOB since old one was worn out. I thought I might broke something, but looking closely I don't see any marks, or chipped chip inside all of them looks intact. If this Fob is done then whats my options? Do I have to tow to dealer for new fob and reprogramming?

There is a video on YT showing how you can do it

but you have to have old working key to make a duplicate key, I dont know without the old key working if you can make another key.

 

I didn't and I will try to do it, but without that chip remote wont even blink red light?

 

Thanks dolj

I was able to put that RFID in my new case now car can start which I couldn't before, but key still not working it had dust and corrosion build on the board due to bad case, which I cleaned it and I think cleaning that cause to board to not work anymore.. So I found key locally for $40 and I'm going to progame it using YT's Video, without your info I wont able to do that. Thanks again! God bless you and your family!!!!!