How to enable USB OTG in Walton Primo F4? I have a Walton Primo F4, running Android 4.2.2. How can I enable USB OTG in my device?
Head into settings, about device, then tap the build number 7 times. From there, head back and you will see a menu called developer options. Tap it,  and tap enable USB debugging. Accept the warning,  and you are done.