I believe I've downloaded all the files I need
I think I got the drivers that came with 'Kindle Fire Utility' to install correctly...
In Device Manager I now have
--Android Composite ADB Device
--Amazon Kindle USB Device
but I don't think its working (might be the 'demo' is blocking access?)
If I do a fastboot -i 0x1949 getvar product
it simply remains at < waiting for device >
running fastboot devices
same for adb devices
Do I maybe need to get a 'Factory Cable' for this one?
--------edited to add---------
Sometimes if I turn the kindle off & back on while connected to the computer it will give an error:
Cannot play video
An error occurred while trying to play your video. The video
may have been interrupted or is in an unsupported format.
Please try again
tap on the 'ok' button & the just screen stays lighted but dark (and it doesn't charge)
so I think the 'demo' basically crashes (but I still can't access the unit)
and one time I got:
The application Status Bar (process com.android.systemui)
has stopped unexpectedly. Please try again
I tapped 'force close', then it gave the above video error, I clicked 'ok'
Then the demo ran normally