Why is the Bluetooth in my Kia Picanto not connecting?

I've been trying to connect my phone to my car's Bluetooth but it keeps failing. I've followed all the steps in the manual but it's still not working. What could be the possible reasons for this issue?

Try resetting the Bluetooth connection and restarting your phone.

Make sure your phone's Bluetooth setting is turned on and your device is visible.

If that doesn't work, try updating the firmware of your car's infotainment system.