How To Fix Issue withAndroid Device Not Connected With USB On Computer by Updating MTP Driver Software

If you have tried the above steps and your device is still not connected then your Computer have a driver problem. You have to firstly confirm that your Computer is detecting an MTP device but not recognizing it. Go to Control Panel >> Hardware and Sound >> View Devices and Printers. If you see your device under “Unspecified” then your computer needs driver update for the device. It may show under Unspecified as either MTP device or Unknown USB Device. I tested this with 2 Android device, both show in unspecified section one display as Unknown USB device and one with no name at all. You can see that in the screenshot below.

Note: If your device didn't show up in devices and printers, try to activate USB debugging mode. To activate USB debugging go to Settings >> About Phone >> Continue Tapping on Build Number until you see a message that says "you are now a developer". Go back to Settings >> Developer Options and Activate USB debugging. SO your device must show up in device and printer page now.
Now all you have to do is to update the Android device driver on your Computer. Let's get started with that.
1. Press Window button on your keyboard and search for Device Manager.

2. Launch Device Manager, the device will show list of systems drivers working on your Computer. Kindly look for where your device shows up, in my own case I found it in other devices and Android device. Yours might vary just make sure you locate it.