https://www.technipages.com/android-developer-options-is-missing
- Open the “Settings” app.
- Scroll down to the bottom and select “About device“, “About phone” or “About tablet“. On some models, select “General” before this step.
- Scroll down to the bottom and tap “Build number” repeatedly. A message should appear on the screen that says “You are now * steps away from being a developer.” Keep tapping until it says “You are now a developer.“
- Now back on the main “Settings” screen, “Developer Options” should appear as a selection
https://stackoverflow.com/questions/23081263/adb-android-device-unauthorized