05-05-2026, 03:53 AM
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#1 |
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Junior Member
 Posts: 3
Karma: 10
Join Date: May 2026
Device: Kindle 4.1.4
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"This item is not signed by an authorized developer."
A relative gave me their old Kindle (4.1.4) and I successfully jailbroke it, but now I can't get KUAL to work. I keep getting the "This item is not signed by an authorized developer. Please contact the developer." message. As per the advice here, I tried reinstalling MKK, but no luck. I just wanna put epubs on it! What can I do?
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05-05-2026, 11:18 AM
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#2 |
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Connoisseur
Posts: 66
Karma: 94
Join Date: Aug 2024
Device: K2 / K4 / PW5
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05-05-2026, 09:31 PM
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#3 |
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Junior Member
Posts: 3
Karma: 10
Join Date: May 2026
Device: Kindle 4.1.4
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Thanks for your answer! Alas, now I get the message "An error occurred: Main class instantiation threw a RunTimeException." 😱
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05-05-2026, 09:41 PM
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#4 |
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Connoisseur
Posts: 66
Karma: 94
Join Date: Aug 2024
Device: K2 / K4 / PW5
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That error means you installed the booklet version of KUAL. It doesn't work on Kindle 4. You can fix it just by running the uninstall.bin file from the KUAL package.
You need to use the kindlet version of KUAL. Just copy KUAL-KDK-1.0.azw2 to your Kindle's documents folder. |
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05-06-2026, 02:30 AM
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#5 |
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Junior Member
Posts: 3
Karma: 10
Join Date: May 2026
Device: Kindle 4.1.4
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Thank you so much! I now have a functioning version of KUAL. Now I just need to add something that can read all those epubs. ��
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