Tools Snapshots of NiLuJe's hacks

[Kindler_jv]

Originally Posted by NiLuJe

Rebuilt both KUAL builds in the first post against an updated keystore (available here).

(It lives in /var/local/java/keystore/developer.keystore)

Had to get creative, so, hopefully this doesn't break on old devices.

----

Here's a completely untested DevCerts build that *should* update your on-device keystore (and *only* that)...

Hi, recently I found my old kindle and I am starting to use it again. I had it jailbroken, with Kual installed and so on. However it wouldn't worked because of the expired certificate.

So I put this under "keys" folder in my kindle 4 NT and re-run Jailbreak Installer, kindle-MKK installer, Kual installer, but still it says that "this content is not signed by an authorized developer". What should I do? It is not clear to me.

Thanks in advance and thanks for updating things to make it work .

[silver18]

Originally Posted by jayrad

Silver18- I am in a very similar spot to you. I was on version 5.1.1 and upon trying to update, it made it to 5.1.2 but started erroring out with code 006, likely because of the updated certs for the jailbreak. Can I ask how you managed to update your kindle touch? I tried the method as described by amazon with the update_kindle_5.3.2.1.bin and then following that with the update_kindle_5.3.7.3.bin but upon running 5.3.2.1.bin- it fails and cannot get any further. I have tried running rescue packs / jailbreak uninstallers to no avail though.
I even tried fastbooting and flashing it back with amazon original certs but I cannot seem to even get fastboot working through the few ways possible.

I feel quite stuck so any help would be appreciated!

Sorry for the delay.
I just used the stock firmware from Amazon for 5.3.7.3 then installed everything again (jailbreak etc).
Firmware was downloaded from Amazon site.

[SpartanHeavy]

Originally Posted by Kindler_jv

still it says that "this content is not signed by an authorized developer". What should I do? It is not clear to me.

Did you install the DevCerts update? You should have downloaded the DevCerts zip file from here, copied the .bin installer from it to your Kindle's root directory, and then used the "update your kindle" option in the settings menu.

Also, you need to make sure that your Kindle has the latest firmware, version 4.1.4. The latest KUAL version won't work if your firmware isn't up to date.

[jayrad]

Originally Posted by silver18

Sorry for the delay.
I just used the stock firmware from Amazon for 5.3.7.3 then installed everything again (jailbreak etc).
Firmware was downloaded from Amazon site.

Yes- when I try the same 5.3.7.3 Amazon update (Drag and drop into the root directory) it doesnt see it as an update file and automatically removes it (Update is greyed out). I can press the update button when doing the 5.3.2.1- but it errors out "Error Code 006" and refuses to go any further.

Just wanted to know if you or anyone else has come across this?

[biofiz]

Originally Posted by dpn703

Been trying on this for hours now, can't figure it out at all.
...
Maybe its because I'm using a DX and it's just outdated since the recent change

To get KUAL running again but with a backdated system date, I used the following method:

1. Install Mobileread Kindlet Kit (MKK)
Download the “kindle-mkk-20141129-r18833.tar.xz” package from: https://www.mobileread.com/forums/sh...d.php?t=225030
Place the correct update file for your Kindle model in the device’s root directory. For my Kindle DX (DXG), the file was Update_mkk-20141129-dxg-B009_install.bin. Then, install the update via the Kindle’s menu.

2. Use an Older KUAL Build
Use an old version of KUAL-KDK-1.0.azw2. I used the following old version:
https://storage.gra.cloud.ovh.net/v1...0250103.tar.xz
Place the KUAL-KDK-1.0.azw2 file into the “documents” folder on your Kindle.

3. Set the Date in the Past
Adjust the Kindle’s system date to a time before the certificate expiration (before April 2025). There are several ways to do this; one simple method (but without flexibility for the date) is using the setdate_kindle_k2_dx.zip utility, from this post: https://www.mobileread.com/forums/sh...d.php?t=365179. You can check current date from the search bar typing ;date and hit Enter from Kindle's keyboard.

4. Now you can run KUAL from the Kindle's menu without an error.

With these steps, KUAL should run again BUT the Kindle’s date is set to the past.

[BigMilk13]

Hey folks,

I've been following along kindlemodding.org's guide for jailbreaking and installing KOReader, Screensaver mod, etc. I have a pretty common Kindle, the Paperwhite 7th Generation, also known as PW3. I went ahead with WinterBreak, and after a little troubleshooting with the hotfix, I got my Kindle jailbroken.

Then I started getting MRPI and KUAL installed. I installed MRPI, then downloaded and installed KUAL (Coplate). When I entered ";log mrpi" into my Kindle's search box, it hung for a second, then crashed, creating a new book called "KPPMainAppV2_5604_002-juno_16020101_muscat_wario-409747_crash_Sep_26_12.40.23_2025.sdr". This "crash log" isn't very helpful, most of it isn't even human-readable, so it's been hard to tell what exactly is going wrong.

I have been combing forums, trying various things:
- Several different versions of KUAL, they all resulted in the same behavior:
- Update_KUALBooklet_hotfix_f190a38_install.bin
- Update_KUALBooklet_hotfix_v2.7.37_install.bin
- Update_KUALBooklet_hotfix_c6ac782_install.bin
- Update_KUALBooklet_HDRepack.bin
- One thread mentioned that some keystore or something got updated in early 2025, and said I should try installing the new keystore using mrpi. I did this, using "Update_mkk-20250419-k5-ALL_keystore-install.bin". It didn't work, silently crashing. After restarting my kindle and trying again, it actually worked. I saw the "hush little baby..." text and it completed the installation. I tried installing KUAL immediately afterwards and it produced a new error log book.
- I have tried installing the .bin files manually by placing them in the root directory of my kindle and using the "update" feature. This does not work, my Kindle immediately deletes any .bin that it doesn't like, including all of the files I have tried using to install KUAL.

I'm getting a bit frustrated now, and figured I'd ask people who know better than I do. Are there any current known issues with jailbreaking and using MRPI on the PW3 Kindle? What should I try doing next? I figure my next steps probably include a factory reset and starting over, in which case, is kindlemodding.org up to date? Or are there alternative KUAL/MRPI versions that I should use for my hardware instead?

Thank you so much for your help

[Not]

Originally Posted by NiLuJe

Rebuilt both KUAL builds in the first post against an updated keystore (available here).

(It lives in /var/local/java/keystore/developer.keystore)

Had to get creative, so, hopefully this doesn't break on old devices.

----

Here's a completely untested DevCerts build that *should* update your on-device keystore (and *only* that)...

The Update worked on a Kindel 4 without Problems

[miciy5]

Originally Posted by chaitanyaI

Hi all,
for all who have issue that "The title is not signed by a registered developer"
I found a temporary solution until developers pitch in to correct the issue.
This is the only solution that worked for me on KPW1 after 3 days and multiple resets. Upgrade to 5.6.1.1 finally after everything worked for me.

I will say what I done, so modify it according to your needs

- Freshly reset the device
- Right now I am in 5.3.3
- Updated it to 5.4.4 (" why, I don't know. I thought it is safe for 5.4.x so why don't update to border ")
- Now jailbreak it as the official snapshot page says.
- Simply put, download "kindle-jailbreak-1.16.N-r19426.tar.xz" > extract kindle-5.4-jailbreak.zip > extract and put all files into root folder of kindle.
- Come to settings > update you will see ***JAIL BREAK***
- Now what I done is, copy the latest .bin for K5 from DevCerts-20250419-KeyStore.zip, placed in root folder
- again, settings > update
- now, install MRPI from this link as instructed. Once you are in 5.6.x.x you cant update any .bin by normal method only MRPI is the way for now.
- now copy latest Kual from official page and extract KUAL-KDK-2.0.azw2 and place in documents folder
- Still you can see when you open KUAL it says error.
- Now magic part, update kindle KPW1 to latest firmware, you know how -> place in root folder then settings > update
Check this screenshot of kindle root folder before updating
- while booting make sure you seen ***BRIDGE+***
- Volla now open KUAL , it worked for me.
- next install extensions like KOREADER or update .bin things using MRPI.

I am happy to write this post, as this should help someone who is struggling to use their old kindles.
This is chaitanya ...

Thank you for the guide! after several hours of stumbling around I finally got KUAL to work!

[Greg_Thompson]

Using this guide: https://www.reddit.com/r/kindle/comm...are&utm_term=1
which makes use of these certs:
https://storage.gra.cloud.ovh.net/v1...loper.keystore

It works flawlessly on my k4b 4.1.4, with one big caveat: as soon as I turn on wifi, the cert gets nuked, an expired cert gets added / updated in the library, and i cant open kual anymore.
this can be fixed by simply applying the cert again, but essentially i can't take the kindle out of airplane mode. If I'm really fast, I can open kual before the cert gets nuked but that solution is, uh, imperfect, and only works once before needing to do the cert again. help?
thanks for all the hard work and guides, particularly spartan and nijule!

[Greg_Thompson]

Update
Was pointed to this solution: https://www.mobileread.com/forums/sh...29#post4545829
working for me so far!

[qadzek]

Originally Posted by facknacken

after these step KUAL is working fine. As soon as I connect to wifi i get "This device is not authorised..." even after trying to rename `/etc/uks` to e.g. `/etc/uks.disabled` as it is stated on the wiki to prevent updates.

I had the same problem on my K4: `This device is not authorized as a test Kindle by the developer of this item. Please contact the developer.` or `This item is not signed by an authorized developer. Please contact the developer.`

The solutions seem to be:
- Keep your Kindle permanently in airplane mode.
- Register your Kindle: Menu button > Settings > Registration. This requires an Amazon account.

Originally Posted by Kindler_jv

So I put this under "keys" folder in my kindle 4 NT and re-run Jailbreak Installer, kindle-MKK installer, Kual installer, but still it says that "this content is not signed by an authorized developer". What should I do? It is not clear to me.

The same should work for you.