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If you are on Android 4.2 and you cant find Developer options or USB debugging , dont worry it is not your firmware issue. In Android 4.2 Jelly bean update Google has hided Developer options menu , by default it is not visible in the Settings menu.

Yo can simply enable this Developer options by following the below method.

How To Enable USB Debugging in Android 4.2 Jelly Bean ?

1. Go to Settings-> About phone.
2. Now tap on the Build number option repeatedly about 7 times.
Now you will get a Toast message you are now a developer.

Thats it ... Now go back to Settings you will see the Developer options placed in the menu and you can enable USB debugging.