how to root your devie | Fix error code 0x14407b
device rooting site-- https://www.kingoapp.com/
here you can download apk and exe file also.
Free download and install KingoRoot Android (PC Version).
Double click the desktop icon of Kingo Android Root and launch it.
Plug your Android device into your computer via USB cable.
Enable USB Debugging mode on your Android device.
Read notifications carefully before rooting your device.