In order to be allowed to sell its smartphones in certain countries or economic areas, Oppo may need to have certifications, such as CE (Europe), R-NZ (Australia/New Zealand) or the FCC-ID (America).

Android 10 (ColorOS 7.0)
Step 1:  Open the  Settings
Step 2:  Tap on  About phone
Step 3:  Tap on  Regulatory
  1. Open the Settings
  2. Tap on About phone
  3. Tap on Regulatory

Oppo Instructions