I'm finally switching.

I'm getting the s25 U as my s21 U has seen better days. I have to change the phone more than once a day en the back glass came completely loose. I also can't take videos on 10x as the stabization doesn't work anymore. But other than that, the phone works well. I don't want it just to sit in a closet. I'm not sure what to do with this phone once I get the new one. Any advice?

My options so far: 1.give it away 2.flash the firmware 3.run Linux on it 4.convert it to a security camera 5.use it as a 3d printer camera 6.keep it as a smart home hub to play music from