The first step: first from the Oppo r9s desktop to find and click into the "set"-"about the phone,"as shown in the picture.
Turn on the phone
Step two: On the phone, find the "version number" option, and then quickly click on the "version number"4 times, then you can see the developer Mode/USB Debug mode has been activated prompted. Then return to the settings again, and then reopen "other settings" as shown in the figure.
Step three: Finally, the "developer option" that was previously hidden in other settings appears, clicking in and Opening "developer Options"and opening the "usb Debug" switch on the bottom. "
Turn on USB debugging
The above is Oppo r9s turn on the USB debugging tutorial, this method is also suitable for oppo r9s Plus, the other R9 is opened this way, you may wish to follow the above steps to operate. Successfully opened USB debugging, you can connect the phone to the computer, with the help of an Android assistant can successfully identify r9s mobile phone for related operations.