This is an exploit chain for Echo Show 5 (2019) (1st gen / checkers / AEOCH). It contains a MediaTek bootrom exploit and a LittleKernel bootloader exploit.
For installation instructions, see https://xdaforums.com/t/unlock-root-twrp-unbrick-amazon-echo-show-5-1st-gen-2019-checkers.4762900/
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.