Get in to Fastboot topic

the fastboot cable does not work with a fire hd 6/7

i can tell you how to get in fastboot without a fastboot cable!

What You Need:

Google SDK (Or adb driver and adb command)
USB Debugging (ADB)

Now connect your Fire and type in your shell or command line:
adb reboot-bootloader

Happy Fastboot!
:D:)