Note: If your driver installed is not suitable for your phone model, also a reason.

Here is the major thing, you must connect your phone though a USB 2.0 port, if not, SP Flash tool will not detect your mobile.

I think you should aware of how to connect and flash by using SP Flash tool, so I m not explaining that here.

You can hear sound while connecting the device to your PC, then an automatic device driver configuration will run in background of your PC, if that is successful, then it's correct driver. Select your device from the list and click Connect. Allow the flash tool to communicate with your test device through adb by accepting the popup that says Allow site access to your ADB keys in order to communicate with devices.

If your phone is not in the condition of power on, just leave it. Open in a browser on your development machine.

Now when my device is off, and plugged into wall, No on screen battery charger indicator.

Ive covered everything, Only this is, I received this 'qualcom dump' after a kernel flash. If it is successful, then we could assume that you have installed the correct driver. When installing OEM oneplus drivers, I had disabled driver signing.

After successful installation of driver software, if your device is capable of turn on, then turn on the mobile and connect to PC to check whether the driver installation is proper.

That will only solve the problem of the fastboot detection. You have to update that driver with the ADB Drivers.

First of all you need to install proper mobile driver from the official phone vendor website in your computer. Mi Flash Tool Driver cannot install Fix How to install drivers for Mi Flash Tool. What you need to do is not install the ADB Drivers separately, but you need to check for the unknown Android device that is shown under the USB devices when you connect the device (via USB port).

Mi flash tool cannot install drivers