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Old 01-04-2026, 07:11 PM   #1
Etxben
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Device: Kindle 4
Need link for KUAL v2.6 for Kindle 4 (FW 4.1.4) - Troubleshooting Journey

Hello everyone,

I'm hoping someone could provide a link for KUAL v2.6. I've been on a long troubleshooting journey with my Kindle 4 (FW 4.1.4) and all signs point to this specific version as the solution.

Here is a summary of what I have done so far. All files were downloaded from the main Snapshots thread (https://www.mobileread.com/forums/sh...php?t=225030):

Installed the jailbreak (kindle-k4-jailbreak-1.8.N). The installation was successful, and I have confirmed this by installing the ScreenSavers hack, which works perfectly.

Installed the MKK (kindle-mkk-20141129-r18833).

Tried to launch the latest KUAL (KUAL-v2.7.37). This gave me the "permissions for this content have expired" error.

Realizing the keys were old, I then installed the latest MKK/DevCerts (from the https://www.mobileread.com/forums/sh....php?p=4506164).

After installing the new keys, the "permissions expired" error went away, but now trying to launch KUAL gives me a new error: "A RuntimeException occurred...".

I've been working through this with an AI assistant. We analyzed the system logs using the ;dumpMessages command, which confirmed that the new MKK is installed correctly, but the latest KUAL version is crashing due to a Java incompatibility with my old firmware (the logs show a NoClassDefFoundError).

Based on all this evidence, the final recommendation is that I need to use an older, compatible version of KUAL. The consensus seems to be that v2.6 is the correct one for my device.

My problem is that I can't find a working download link for v2.6. Could someone please be so kind as to share the KUAL-v2.6.zip file or point me to a working link?

Thank you so much for your time and for all your amazing work!
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Old 01-04-2026, 08:48 PM   #2
SpartanHeavy
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Quote:
Originally Posted by Etxben View Post
now trying to launch KUAL gives me a new error: "A RuntimeException occurred...".
That error probably means you installed the booklet version of KUAL. It doesn't work on Kindle 4.

You should be able to fix it just by running the uninstall.bin file from the KUAL package.
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Old 01-05-2026, 03:55 AM   #3
Etxben
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Quote:
Originally Posted by SpartanHeavy View Post
That error probably means you installed the booklet version of KUAL. It doesn't work on Kindle 4.

You should be able to fix it just by running the uninstall.bin file from the KUAL package.
You were absolutely right. That was exactly the problem. KUAL is working perfectly now!
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