How to enable USB Debugging in Samsung Galaxy S4(GT-I9500)?
STEP 2. ENABLING USB DEBUGGING
c). Now tap on About device :
d). Scroll down and tap Build number several times until you see a message that says “Developer mode has been enabled“.
e). Now tap the back button to move on More option. You will see Developer options under System manager, Tap on it. Under Developer options, tap on USB Debugging :
STEP 3. USB DEBUGGING
f). Tap on OK as shown below :
USB Debugging is enabled now :