This is an exploit chain for Fire 7 (2015) (5th gen / ford / KFFOWI). It contains a MediaTek bootrom exploit and a LittleKernel bootloader exploit.
It is also partially applicable to the Fire 7 (2017) (7th gen / austin / KFAUWI), but lacks display support.
For installation instructions, see https://forum.xda-developers.com/amazon-fire/development/unlock-fire-t3899860
brom-payload includes code from Linux kernel, and is therefore licensed under GPLv2.
lk-payload, modules and microloader are licensed under MIT.
See LICENSE.MIT and LICENSE.GPL2 for more details.