1st gen bricked KindleFire, Fastboot possible with ADT tools or Android studio?

I’ve a KindleFire that is bricked in the logo loop, and I understand that I need to access Fastboot to be able to write commands to it to try to reprogram it? Can I do so using adb or the sdk and a file that is there called fasttools? I’ve got Android studio on my laptop. Do you know how I can get this to work? The android studio is not seeing the device. I can’t enable a USB developer setting or access the KindleFire setup.
I heard there’s a motherboard short but don’t know about how or where either. Thanks