The Hard Reset is also commonly known as factory reset. This tutorial will show you the easiest way to perform a factory reset operation in OPPO R15. Find out the way to remove all personal data, customized settings and installed apps from OPPO R15.
As a result your Android 8.1 Oreo will run faster, you will be able to use the entire 128000 MB storage and Li-Polymer 3450.0 mAh battery will work longer. Let's restore defaults in OPPO R15 and enjoy using your phone as it comes from the manufacturer.