Way 3. Enable WhatsApp Notification. Way 4: Update Android System. Way 5: Reset App Preferences. As we mentioned the reasons that may cause Oppo WhatsApp notification problem. Now let's see how to resolve and fix the Oppo WhatsApp notification problem in corresponding ways. Way 1. Ensure Internet Is Ok.
2. Now, boot your device into the TWRP mode by pressing the correct key combinations. This can be different for every device. Most of the times, by pressing the Power and Volume down button at the same time, you can enter your phone into its TWRP recovery mode. Tap on the “Wipe” button in order to reset your device.
The only thing to take into account is that your OPPO A15 will have to be turned off to activate Recovery Mode (if it is blocked, wait until the battery is completely empty before doing so). Try one of these methods to enable it: Hold down the volume up button and the Power button for several seconds. Hold down the volume up button, volume down
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