Thread: K4 KUAL not launching on Kindle 4 Non-Touch (fw 4.0.1) after jailbreak – need help
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Old 08-07-2026, 08:37 AM   #2
Frogm4n
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Join Date: Jul 2023
Device: Scribe 2022, OA2, PRS-350
The old certs have expired and you need to update the firmware to 4.1.4 for the 2025 Dev Certs to work.

It's not likely the jailbreak blocking update, as the old K4NT needs to be updated step-wise to get to the latest version.

https://www.amazon.com/gp/help/custo...DD8E64F7AAEF8A
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