Factory Reset Method
Step 1: Turn off your Oppo smartphone by holding down the Power button for a few seconds.
Step 2: After your phone is turned off press and hold together the Volume Down and Power button for a few seconds.
Step 3: When the OPPO logo shows up on the screen, release all the buttons.
Step 4: Later, select your preferred language by using Volume buttons and the Power button to select it.
Step 5: Select Wipe data and cache twice and confirm by pressing the Power Button.
Step 6: Confirm the process by selecting 'Yes' with the Power button.
Step 7: Scroll to “Reboot” using the Volume buttons and press the Power button to restart the device’s system.