There are a few potential causes for this. One possibility is that your fire stick was recently reset or you may have forgotten your PIN. If you’ve forgotten your PIN, you can reset your fire stick by going to the settings menu and selecting “Reset Fire Stick.” Another possibility is that your fire stick is infected with a virus and needs to be cleaned before it will work again. To clean your fire stick, go to the settings menu and select “Clean Fire Stick.
Yes, you can change the password on your Firestick. To do this, go to Settings -> System -> Password and enter a new password.
