How to turn on the USB debug switch?

If your phone's operating system version is below 4.2, the steps to turn on the USB debugging switch are:

  1. Open [Settings].
  2. Select [Applications].
  3. Check [Unknown Source] and select [Development].
  4. Check [USB Debug Switch].

If the operating system version of the phone is 4.2 and above, the steps to open the USB debugging switch are:

  1. Open [Settings].
  2. Click [About Phone].
  3. Scroll to the bottom of the screen, find [version number], and quickly type 5-7.
  4. After a quick click, if you see "You are in developer mode" in the image below, your click is successful; if not, please continue to click quickly until it appears.
  5. Go back to the Settings page and you'll find [Developer Options].
  6. Go to "Developer Options" and click on the "USB Debugging" option.