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:
https://www.mobileread.com/forums/sho...d.php?t=203326
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.
Last step:
https://www.mobileread.com/forums/sho...&postcount=116
Download
FLoff.zip, 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.