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If you want to change the time manually, you must deactivate the "Use time from network" function on the Oppo Smartphone, after which the menu item appears so that you can change the time.

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  Additional settings
Step 3: Tap on  Date & time
Step 4: Turn Off  Set automatically
Step 5: Tap on  Time
Step 6: Set the  Time
  1. Tap on Settings
  2. Tap on Additional settings
  3. Tap on Date & time
  4. Turn Off Set automatically
  5. Tap on Time
  6. Set the Time
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Oppo Instructions