Run Kual on K4 4.1.1

Hey everyone,

I have a Kindle 4 NT, which I downgradedfrom 4.1.4 with Kubrik to 4.11 to prevent OTA updates.
I also applied the jailbreak.
Now I want to install KUAL (KUAL-KDK-1.0.azw2) but it doesn't run anymore.

Here are my current steps:

- install mkk-20141129
- install mkk-20250419
- copy kual file to /documents.

When running KUAl I get the error "This item is not signed by an authorized developer,...."

Can you help me with that?