I can successfully activate fastboot mode and (apparently) flash TWRP 18.104.22.168, as per this guide:
However, the Kindle Fire will not boot into recovery, is not visible via ADB, and will not boot into the demo software anymore. I can still access fastboot by using a gerry-rigged factory cable, but thus far all my attempts to boot to recovery have failed.
The following are the results of my most recent attempt to flash TWRP:
C:\Users\Harrson\Downloads\adt-bundle-windows-x86_64-20131030\adt-bundle-windows-x86_64-20131030\sdk\platform-tools>fastboot -i 0x1949 flash recovery C:\Users\Harrson\Downloads\openrecovery-twrp-22.214.171.124-blaze.img
sending 'recovery' (4856 KB)...
OKAY [ 1.219s]
OKAY [ 0.831s]
finished. total time: 2.052s
C:\Users\Harrson\Downloads\adt-bundle-windows-x86_64-20131030\adt-bundle-windows-x86_64-20131030\sdk\platform-tools>fastboot -i 0x1949 oem idme bootmode 5001
OKAY [ 0.081s]
finished. total time: 0.081s
When I reboot, regardless of whether it's connected by USB or not, I get only a blank screen. No Kindle Fire logo, no nothing. The only way to get any activity on screen is to boot into fastboot using the factory cable.
I'd really appreciate any help you can give.