According to your PM, you want Coolreader because it has an option to turn of the front light. HackedupReader doesn't have that option so that will be a waste of time.
I think KUAL with the Frontlight toggle extension is a better option:
Download the prerequisites-all-supported-devices.zip
from that post. Extract the file update_k5_ALL_PW_ALL_kindlet_jailbreak_install.bin
, place it on the root of your Kindle, Menu > Settings > Menu > Update- Just like the Jailbreak bin.
Download KUAL.V.0.4.zip, extract KindleLauncher-2.0.azw2
and place it in the documents folder on your Kindle.
, place the contents of that zip- the folder named FrontLight
- in a folder named extensions
on the root of your kindle.
Launch KUAL, It should be on your kindle home page along with your other documents/books. Once KUAL is running, the Toggle buttons should be available to you.