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With the Galaxy S9 powered off, press and hold the Volume Up and Bixby buttons.
Continue to hold both buttons, then press and release the Power button to power the device on.
Release all buttons when the Samsung logo appears. ...
Use the volume buttons to toggle the selection to Wipe data / factory reset.
Soft Reset
A soft reset will simply force a reboot in the event the S9 has become frozen or unresponsive. Data will not be cleared from the device after a soft reset.
Press and hold Volume Down + Power buttons for about 10 seconds. The device should restart.
Option 2
Open Settings General management Reset Factory data reset Reset Delete all
