Thanks Meter 303
Join Date: Feb 2013
Location: New Braunfels, TX
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You are completely right it is a driver issue, you need to install the drivers for fastboot, if the ones you have didn't cover it, update the driver of that device with a triangle next to it to the ones in my signature. And yes that is what fastboot mode looks like on the kindle fire hd's.
Sent from my Amazon Kindle Fire HD running CM10.1 Tablet UI using xda-developers app
My Wallpaper Fix for KF2, KFHD 7", and KFHD 8.9" is HERE
Please Read the instructions and use the debugger if you run into errors.
My own modified adb drivers for just about all kindles (includes old twrp and cm versions) HERE
Tablet UI Patch for latest CM10.1 build HERE