If you plug the Priv into your Windows PC while in Fastboot mode and it shows up as "QHUSB_BULK" or an unknown device, you are missing the drivers.
Keep holding both buttons for a few seconds until the screen lights up and the bootloader menu appears. how to open fastboot mode on blackberry priv hot
If you are facing a boot loop, knowing how to enter this mode is the first step to using an autoloader tool to factory reset or reinstall the operating system. If you plug the Priv into your Windows
Why is my BlackBerry Priv stuck in a boot loop when trying to open Fastboot? how to open fastboot mode on blackberry priv hot