USB Debugging option greyed out

Question

I have an LG-E405 phone running Android 2.3.6.

I connected my phone with a USB cable and selected the mode as Charge Only.

Now when I try to tur

Answer 1

Try selecting the default mode as Internet connection.

Go to Settings -> Connectivity -> Default Mode -> Internet Connection.

Now enable the USB Debugging mode under Applications -> Development -> USB Debugging.

It worked for me.