Oppo How to Change Screen lock PIN, Password or Pattern
Oppo 17952
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 To change the screen lock password, pattern or PIN, the lock screen does not need to be set up again. After opening the screen lock settings, there is a corresponding option to change the unlock method on the Oppo smartphone.
 Android 11 | ColorOS 11.0   
  
    
    
    
   - Tap on Settings
- Tap on Password & biometrics
- Tap on Lock screen password
- Tap on Modify password and follow the instructions on screen