To reset your Samsung Galaxy S9 and S9+ from recovery mode, first Power off your phone, and then press and hold the "Volume Up + Bixby + Power button" together for a few seconds. You’ll see the Galaxy S9 boot-up screen, but don’t release the buttons yet. You need to keep holding the three buttons until you see the recovery mode screen.
In the recovery mode, you need to use the Volume Up and Down buttons to navigate between the options. In this case, we will scroll down to the “wipe data/factory reset” option by pressing the Volume down button and then select it by pressing the Power button. You’ll receive a warning that this cannot be undone, along with a final confirmation in Yes or No. Press volume down button once to highlight Yes, and then the Power button to confirm resetting your Galaxy S9 to factory settings.
