You can read this here to know how to fix Fastboot no detecting your device problem.
You can download the Fastboot fix driver from the link below:
How to Download From the Above Link?
1. Unlock the link by Subscribing to the channel.
Note: Subscribing to the channel is your choice you can get the download link even without subscribing, but to support us then please subscribe to our Youtube channel thanks.
2. Now after unlocking, come back and click on the download link.
3. Now just click on the download button and your download will start automatically.
You can also watch the video below to know how to install the driver: