2020 Sportage GT-Line CRDi
Have you tried switching the main fuse switch, it is usually in the fuse box next to the driver. If you switch it off it drops power to most the accessories and things like central door locking, so you need to stay with the car. Leave it for 15 minutes and then switch it on. With luck it will reset your head unit, otherwise you may need to visit a Kia dealer.