Using a Kindle 4 NT, I followed the jailbreak guide here (except for the ssh part):
https://wiki.mobileread.com/wiki/Kindle4NTHacking
I then followed the cr3runner guide here:
https://github.com/CrazyCoder/coolre...uide-for-k3k4n
Cool Reader is appearing as an item in my kindle menu, but when I start it I get the following error message:
"The device is not authorized as a test kindle by the developer of this item".
How can I fix this?