Can't unlock bootloader Moto G5 XT1672 I'm trying to unlock the bootloader on my Moto G5, the adb commands works, but I can't find my device in the command prompt when it is in fastboot mode. 

I was following the instructions on this tutorial, but when running the adb device command to get my serial number, the PC can't find the device. I checked the USB cable and the connection between the device and the computer and everything is ok. 

To enter the fastboot mode I was using the adb reboot bootloadercommand on Windows. 

Android 8.1.0
Security patch: October 1, 2018
As acejavelin said, I was missing the fastboot driver, for some reason it wasn't finding my phone. Installing the right driver solved the problem.