Press and hold the Power button (right side of the phone) until the power menu appears.
On the screen, you will see options: Power Off , Restart , and Screenshot . Do not tap any of these yet.
If your Oppo A38 is acting up—random crashes, aggressive pop-up ads, rapid battery drain, or apps that refuse to open—you need a diagnostic tool that cuts through the noise. That tool is Safe Mode (Modo Seguro).
In this guide, we will go beyond the basic steps. You will learn not just how to activate Safe Mode on the Oppo A38, but how to do it better —faster, more effectively, and with a clear plan to fix your phone afterward. Safe Mode is a diagnostic environment built into Android. When activated, your Oppo A38 temporarily disables all third-party apps . You will only see the pre-installed system apps (Google, Phone, Messages, Camera, etc.).