When the system settings on the Oppo Smartphone are reset, no data is deleted, only the settings from the device itself, including the network settings (including WLAN passwords, etc.), the wallpaper and the ring tones.

Android 10 (ColorOS 7.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Additional settings
Step 3:  Tap on  Back up and reset
Step 4:  Tap on  Erase all data (factory reset)
Step 5:  Tap on  Reset system settings only
Step 6:  Enter your  Password/PIN/Pattern
Step 7:  Tap on  Reset system settings only
Step 8:  Confirm with  Reset system settings only
  1. Open the Settings
  2. Tap on Additional settings
  3. Tap on Back up and reset
  4. Tap on Erase all data (factory reset)
  5. Tap on Reset system settings only
  6. Enter your Password/PIN/Pattern
  7. Tap on Reset system settings only
  8. Confirm with Reset system settings only

Oppo Instructions
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