Tap on (this is usually a separate sub-menu within About device). Locate the Build number and tap it 7 times quickly.
Scroll down to find and tap it to open the full list of features. Key Features You Can Now Use how to open developer options on oppo a38
: Can be adjusted to make the phone feel faster by shortening transition times. OEM Unlocking : A prerequisite for bootloader modification. Tap on (this is usually a separate sub-menu