Run Kual on K4 4.1.1

jameshouser · 07-31-2025, 03:45 PM

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?

Frogm4n · 08-01-2025, 01:59 PM

The newer Dev Certs need the latest firmware. Why bother downgrading the firmware to avoid OTA? It hasn't had an OTA update since 2011.

jameshouser · 08-01-2025, 02:39 PM

I want to use my Kindle as a Dashboard, but for this I need a WIFI connection.

Whenever leave my WIFI connection on for several minutes on 4.1.4 I lose my jailbreak and MRR.

07-31-2025, 03:45 PM	#1
jameshouser Junior Member Posts: 2 Karma: 10 Join Date: Jul 2025 Device: Kindle4NT	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?

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08-01-2025, 01:59 PM	#2
Frogm4n Evangelist Posts: 462 Karma: 3579113 Join Date: Jul 2023 Device: Scribe 2022, OA2, PRS-350	The newer Dev Certs need the latest firmware. Why bother downgrading the firmware to avoid OTA? It hasn't had an OTA update since 2011.

08-01-2025, 02:39 PM	#3
jameshouser Junior Member Posts: 2 Karma: 10 Join Date: Jul 2025 Device: Kindle4NT	I want to use my Kindle as a Dashboard, but for this I need a WIFI connection. Whenever leave my WIFI connection on for several minutes on 4.1.4 I lose my jailbreak and MRR.