Help, i fastboot doesnt work!

So I am no stranger too rooting, but i managed to do something wrong when dirty flashing a rom update.
Gapps no longer works, my device is un-rooted and the 'gapps stopped working' notification pops up every 1 second, making my device unusuable.
I'm using the Amazon Fire 7" running SlimLP. To be clear, this was all working at a point.
I could boot TWRP and fix this with a backup I made, but here's the problem: Fastboot commands isn't working.
I can use ADB and boot into fastboot mode, but once there my commands have no effect and the Windows 7 CMD just displays <waiting for device>.
Also, my stock recovery seems to be deleted so I have no recovery whatsoever.
I have all the correct drivers and used the google sdk drivers to no effect. Also, in device manager my device shows up as 'Android Bootloader interface' and shows: This device cannot start. (Code 10).

So to Sumarise
My device needs a backup flashed
Fastboot commands are unresponsive
I have no root.
I have all the drivers installed
I am using a 2015 Kindle fire 7"
With a windows 7 64 bit laptop

Please help!!!
Thanks in advance

If you need any more info, drop me to a comment and I will get back to you ASAP, I'm desperate!
I can use flashfire, and Im open to any workarounds.

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