Programmatically switch to developer mode in Android

Question

I want to create a tool that allows to switch to developer mode on Android devices with an Android version less than 4.2. I want to create an apk to activate and deactivate

Answer 1

"Developer" mode is a system setting and therefore can only be modified from a system application (i.e. signed with a manufacturer's key). You cannot create an app that would modify this setting.