Sometimes you may decide to flash or upgrade your Android device via flash tool or you want to root your android device via iroot or any rooting tool and you need to enable USB debugging mode in order to connect and communicate with your Android device. By default the USB debugging mode is
disabled for any brand new device to avoid unintentional modifications on your device. But you need to enable debugging option manually for your Android development process. For different Android versions there will be different configurations to turn the USB debugging mode.
I notice that most of infinix phone and lenovo devices has invisible Developer Options and without it you can not enable usb debugging mode.Don't worry about it i will show you how to make your developer option visible like other devices.

How to make your android device developer options visible
Open Settings andscroll down to About on your Android phone or tablet.
If you have a Samsung Galaxy device with Android 4.2, open Settings> More tab> About and tap it.
Now scroll to Build number and tap it 7times.
After tapping the Build Number 7 times, you will see a message “You are now a developer!” If you have a Galaxy S4 or any other Samsung Galaxy device with Android 4.2, the message reads as follows- “Developer mode has been enabled”.

Now to enable USB debugging after you make your developer options visible
Just goto Settings> Developer Options> USB Debugging
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