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Old 05-02-2026, 08:50 PM   #1456
SpartanHeavy
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Quote:
Originally Posted by famewolf View Post
WHat exactly am I supposed to do with this? I have a Kindle PW1 which I downgraded to 5.3.3 and installed the jailbreak. Nothing I've tried including installing the mkk and the 2025 updated devcerts package someone provided has allowed KUAL to get past the "not signed by an authorized developer". I have no idea how to update the firmware. The only things I've seen so far is someone installing and using an older KUAL version with there system date on the kindle set back or some folks updated back to 5.6.1 and the jailbreak is supposed to survive?

Can someone tell me what I should do clearly and if it's upgrade back to 5.6.1 do I need to download it manually or just take the device out of airplane mode?
You need to update the firmware to 5.6.1.1. The jailbreak will survive the update. Instructions for updating are here:

https://www.amazon.com/gp/help/custo...AE5G5UGCYA25DW

After it's updated, follow the instructions on the Kindle Modding Wiki beginning with installing the universal hotfix:

https://kindlemodding.org/jailbreaki...g-up-a-hotfix/
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Old 05-02-2026, 11:13 PM   #1457
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Quote:
Originally Posted by SpartanHeavy View Post
You need to update the firmware to 5.6.1.1. The jailbreak will survive the update. Instructions for updating are here:

https://www.amazon.com/gp/help/custo...AE5G5UGCYA25DW

After it's updated, follow the instructions on the Kindle Modding Wiki beginning with installing the universal hotfix:

https://kindlemodding.org/jailbreaki...g-up-a-hotfix/

Thank you! I've upgraded, installed KUAL and MRPI then installed the hotfix via MRPI.

Now to look at all the packages!
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Old 05-10-2026, 01:29 PM   #1458
koopatrav
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Hi there. I've been trying to jailbreak my Kindle 4 in advance of Amazon ending support later this month, and I'm having some issues with a persistent U007 update error code when I try to do the MKK Update. Here's what I'm working with:
  • K4, firmware 4.1.4 (build 3543630001)
  • Jailbreak applies successfully (You Are Jailbroken document appears)
  • MKK install (Update_mkk-20141129-k4-ALL_install.bin) consistently fails with U007
  • DevCerts likewise fails with U007
  • developer folder exists in root but contains only a KUAL subfolder, no keystore
  • Airplane mode on, OTA block folder removed during attempts
  • Tried immediately after fresh jailbreak reapplication
If I could get any help on how to correct the error, I would really appreciate it. Thanks for all the good info in this thread so far!
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Old 05-10-2026, 07:16 PM   #1459
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Quote:
Originally Posted by koopatrav View Post
Hi there. I've been trying to jailbreak my Kindle 4 in advance of Amazon ending support later this month, and I'm having some issues with a persistent U007 update error code when I try to do the MKK Update. Here's what I'm working with:
  • K4, firmware 4.1.4 (build 3543630001)
  • Jailbreak applies successfully (You Are Jailbroken document appears)
  • MKK install (Update_mkk-20141129-k4-ALL_install.bin) consistently fails with U007
  • DevCerts likewise fails with U007
  • developer folder exists in root but contains only a KUAL subfolder, no keystore
  • Airplane mode on, OTA block folder removed during attempts
  • Tried immediately after fresh jailbreak reapplication
If I could get any help on how to correct the error, I would really appreciate it. Thanks for all the good info in this thread so far!
See this thread:

https://www.mobileread.com/forums/sh...d.php?t=373062
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Old 05-12-2026, 08:26 PM   #1460
Maru
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Help with KUAL: I have never done anything like this. I have tried following the step by step on the kindlemodding page, I got the jailbreak part down but I cannot get passed the "application is not signed by a registered developer" error message on the kindle. I have a very old one from 2009. HELP the layman
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Old 05-13-2026, 11:30 AM   #1461
famewolf
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Quote:
Originally Posted by Maru View Post
Help with KUAL: I have never done anything like this. I have tried following the step by step on the kindlemodding page, I got the jailbreak part down but I cannot get passed the "application is not signed by a registered developer" error message on the kindle. I have a very old one from 2009. HELP the layman
You need to install the MKK package which updates the signatures so the package is authorized. See the first post.
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Old 05-15-2026, 10:53 PM   #1462
koopatrav
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Originally Posted by dcarvil View Post
Thank you, that helped!
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Old 05-17-2026, 01:41 PM   #1463
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Alright, I think I am losing my mind. I must be missing something really obvious and I am tearing my hair out.

So, I have a PW1 (B024 serial), downgraded the firmware to 5.4.4 and installed the jailbreak according to intructions on threads around here. It seems to already have the MKK hotfix. No issues there.

Now I want to install MRPI and KUAL and... nothing is happening? How do I start these? Did I copy the stuff to the wrong folder or something? How do I get KUAL to actually install?


This is what my kindle looks like right now:


What am I doing wrong?

I would like to actually get KO reader to work because the downgrade nuked all my collections and seems to think all of my books were added today and that's annoying AF.
Last edited by aerynsun; 05-17-2026 at 01:44 PM.
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Old 05-17-2026, 02:52 PM   #1464
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Quote:
Originally Posted by aerynsun View Post
No issues there.
The issues is precisely there: you not understanding what's the reason your installing various things and what the KUAL not opening boils down to.

So let's try and spell it out: any jailbreak and any jailbreak hotfix that was released before April 2025 contains / "bundles" MKK ( = developer certificate keystore + some other stuff) with certificates that expired in the middle of April 2025.

So the things you have in that MKK folded you see (and another location that you don't see over USB cable) that was put there by installing that ancient jailbreak installer has been useless for more than a year now.

Since nobody cared enough to update that jailbreak archive nor old hotfix in NiLuJe's snapshots thread after jailbreaking and installing hotfix you're still in broken / not working state, so you need to install another thing to replace the expired certificate with a valid one.

This: https://www.mobileread.com/forums/sh...postcount=1295
("K5 ALL" is the one you use for PW1)

And you also need to download and install the latest version of KUAL that's been signed to use that new certificate instead of the old, expired one. You get that from the first post in this thread. Don't use azw2 file / "kindlet" KUAL on a PW1, install the "booklet" KUAL ( = installer.bin). Remove the old KUAL azw2 file from the "documents" folder first.

And one more thing: you didn't "install" MRPI correctly since your screenshot shows "kual-mrinstaller-1.7..." folder that's not supposed to be copied to your Kindle : only the content inside THAT folder goes inside "extensions" folder ( = so you end up with "E:\extensions\MR Installer\" IIRC the actual name MRPI extension uses) on your Kindle.

And also you will need to update back to 5.6.1.1 after you jailbreak AND install the latest jailbreak hotfix (needed so your jailbreak survives firmware update) + restart 2 more times. Then after firmware update AGAIN do hotfix installing + install DevCerts bin + install KUAL bin.
Last edited by shamanNS; 05-17-2026 at 02:58 PM.
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Old 05-18-2026, 01:39 PM   #1465
aerynsun
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Quote:
Originally Posted by shamanNS View Post
The issues is precisely there: you not understanding what's the reason your installing various things and what the KUAL not opening boils down to.
Thank you! You're right, I'm not terribly good at this kind of stuff. Know just enough to get myself in trouble. I did try the winterbreak method first and also didn't work.

And thank you for taking the time to spell everything out step by step. I feel like all of this info is out there but split amongst several threads and some of it is not terribly clear for a newb.
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Old 05-18-2026, 01:50 PM   #1466
aerynsun
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And another total newb question: how to check that the jailbreak/hotfix is now correct?
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Old 05-19-2026, 08:28 AM   #1467
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If hotfix and/or KUAL installer bin has installed without any errors the jailbreak works.
If using ;log search-bar command outputs some text at the top of Kindle screen hotfix did its job.
And if KUAL now opens you fixed the DevCerts / MKK issues.
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Old Yesterday, 12:05 AM   #1468
can.alex
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Kindle DX (B004, FW 2.5.6) - MRPI not triggering, KUAL cert error persists after KeyS
Quote:
Originally Posted by NiLuJe View Post
You'll find here links to the current packages for all my stuff. This means that this will always point to the latest available versions (think rolling releases).
They're grouped here in a single post as a convenience, both for me (much easier & faster to upload), and for you (that's the easiest way to get properly arranged source files for these packages).

On a sidenote, most of these are distributed as xz compressed tarballs (because it's much, much more efficient) so you'll need GNU tar/bsdtar + xz-utils on Linux/BSD/OS X, and something that can handle those files on Windows (f.g., 7-zip or WinRAR 5). On Windows, be extremely wary of unarchiving software providing a 'smart' CR/LF handling [i.e., WinZip]: do NOT let it affect the line endings of these files, because that would break things in fun and interesting ways.

Now that this is out of the way, on to the good stuff!

The listing follows this format:
Description | D/L Link | Last Modified | Size | MD5 Checksum | MR Thread

(A barebones version of this listing is also available here).

Packages targeting the Kindle 2/DX/DXG/3/4:

Packages targeting the Kindle 5 (Touch/PW1/PW2/KT2/KV/PW3/KOA/KT3/KOA2/PW4/KT4/KOA3/PW5):

KUAL & KUAL extensions:

KindleTool:

Misc. Stuff:

Packages targeting Kobo devices:


Last updated on Thur, 03 Jan 2025 13:37:00 +0100

Hi all,

I've been trying to install KOReader on my Kindle DX (serial B004, firmware 2.5.6) to read CBZ comics fullscreen, and I'm stuck on getting MRPI to run.

Here's what I've done so far:
- Jailbreak installed successfully ✓
- MKK installed successfully ✓
- DevCerts-20250419 KeyStore installed (used the B004-specific .bin) ✓
- MRPI extracted to root: /extensions/mrinstaller/ contains bin, data, lib, log subfolders plus config XML, credits TXT and menu.json ✓
- /mrpackages/ contains Update_KUALBooklet_v2_7_37_install.bin ✓
- KUAL-KDK-1.0.azw2 is in /documents/ ✓

Problems:
1. KUAL still shows "This title is not signed by a registered developer" even after installing the keystore with wifi off.
2. The ;log mrpi command does nothing — I type it in the home search bar and it just returns "no items found". I understand this trigger may not work on 2.5.x firmware.
3. I tried placing an empty file named mrpi inside /mrpackages/ and reconnecting, but nothing happens.

I'm on Linux (OpenSuse), wifi has been off the entire time since installing the keystore.

Is ;log mrpi simply not supported on firmware 2.5.x? Is there a different way to trigger MRPI on this firmware? And is there any workaround for the KUAL cert issue on the DX specifically?

Thanks in advance.
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Old Yesterday, 05:34 AM   #1469
shamanNS
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Quote:
/mrpackages/ contains Update_KUALBooklet_v2_7_37_install.bin
Now go an run the uninstaller bin for KUAL booklet since Kindle DX doesn't even support booklets.. You use azw2 file only ( = "kindlet" version of KUAL). IIRC people here even reported that installing booklet version caused problems with using kindlet KUAL on something like Kindle 4.

As for MRPI I'm not even sure if it supports DX and works on it but I'm 85% certain that using MRPI on those devices using firmware v2, v3 and v4 ( = anything older than Kindle Touch) isn't even needed. As far as I recall days of me owning a Kindle 3 on those devices you simply install any custom bin installer file by copying it to the "root" ( = top level) of kindle drive (so NOT into "mrpackages" sub-directory) > eject from computer > use "Update Your Kindle" option somewhere in Kindle UI.

= you run custom bin files the same way you would manually do an official firmware update.

MRPI was introduced somewhere around Kindle PW2 & firmware 5.7.x? when Amazon made it difficult to use "Update Your Kindle" for custom bin installers.
Last edited by shamanNS; Yesterday at 05:37 AM.
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Old Yesterday, 12:06 PM   #1470
SpartanHeavy
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Quote:
Originally Posted by can.alex View Post
I've been trying to install KOReader on my Kindle DX (serial B004, firmware 2.5.6) to read CBZ comics fullscreen
You don't need KOReader. Kindle DX actually has CBZ support built in.

https://www.youtube.com/watch?v=cbEYt0Bcn20

If you want to use KOReader anyway, it's much easier to just use launchpad to start it instead of KUAL.
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