Trying to flash TWRP and root my Nexus 5X. 

I'm running the N 7.1.1 preview.

I've got the adb and fastboot files downloaded and allegedly working

```
adb devices 

```

and

```
adb reboot bootloader

```

work as they should.

The Android bootloader info shows that I'm in FASTBOOT MODE, SECURE BOOT is enabled, and DEVICE STATE is unlocked.

But 

```
fastboot devices

```

doesn't list anything at all.

I'm running windows 10, and when viewing Device Manager, it shows my bootloader-ed nexus 5x as a "Kedacom USB Device" and "Android Bootloader Interface" in the sub list.

But, it won't allow me to replace the drivers with the Google USB Driver, it doesn't even recognize the driver files in the extracted google driver files I downloaded from the Android Studio software.

Not sure what the issue is, but I'm thinking it's an issue with the driver on my end, but then why did the adb half of this work by default?