K4 This device is not authorised as a test kindle

superpomme · 03-24-2023, 07:06 AM

Hi, I was wondering if anyone can help me. I got a k4 set up with the jailbreak, mkk, usb networking, kual, and python3, and I set it to auto load ssh on boot.

Everything was working fine and then I tried to get it to connect to wifi, but it was refusing. I went into usb networking and set it to use a unique mac, and the wifi then connected, however now it is refusing to load kual stating "This device is not authorised as a test kindle"

I tried a reboot, a hard reboot, a reinstall of the jailbreak, reinstall of mkk but it is still doing the same.

k4 silver, with the version showing 4.1.4. Note that this isn't registered - is that needed?

I do still have ssh access to it - is there any way to get kual working again?

Thank you

superpomme · 03-24-2023, 08:03 AM

Sorry - I got it working!

For the record, I was being dumb, and left the wifi on, so each time I reinstalled mkk, it then updated and blocked it.

Turned off wifi
installed mkk again
helper+ -> "prevent OTA updates"

(I had clicked the prevent ota earlier, but while in usbnetworking mode so it hadn't installed)

Thanks. Can I mark this thread resolved?

superpomme · 03-24-2023, 09:17 AM

really sorry to spam this post, but that only seems to fix it for a while and then it blocks it again. Is there something I'm missing here? I have other ones that are working fine on wifi without getting blocked.

Thanks

-> I tried blocking the kindle wan access, but doing so looks to then block the device from working over wifi too. I note that the kindles that aren't giving me these issues are on 4.1.1 while the ones that are blocking me look to be on 4.1.4 - would this explain the disparity?

-> for future reference - I used Kubrick which worked perfectly, and was able to downgrade to 4.1.1 which doesn't have the same issue. All working great now.

mattcd216 · 04-06-2023, 01:06 PM

Any luck with this? Same for me - keep trying mkk install, but every time wifi turns on I get the error message when trying to use kual.

matt

superpomme · 05-14-2023, 07:54 AM

sorry, didn't see your reply. Yea the fix was to downgrade the kindle firmware using Kubrick

tubular · 07-10-2023, 07:23 PM

Quote:

Originally Posted by superpomme

sorry, didn't see your reply. Yea the fix was to downgrade the kindle firmware using Kubrick

Hello, may I ask you how you used Kubrick exactly?
I was unable to boot Kubrick using a USB flash drive. I had more succes in a virtual machine, but now I am stuck at "Putting device into Fastboot mode ... Waiting for device".

screenshot

I have exactly the same model and my device is also on the 4.1.4 firmware. I am unable to install KUAL because of the "This device is not authorized as a test Kindle by the developer of this item" error.

tubular · 07-10-2023, 07:49 PM

Edit: I managed to install KUAL. The trick was indeed to put the Kindle in airplane mode before reinstalling MKK. Thanks a lot for describing your solution, superpomme.

I am still interested in a downgrade to 4.1.1 however, because you indicated this is only a temporary fix.

tubular · 07-17-2023, 03:35 AM

It turns out that was only a temporary fix indeed. The "This device is not authorized as a test Kindle by the developer of this item" error resurfaced.

I don't know yet if it solves this issue, but finally I did manage to downgrade the firmware to 4.1.1 using Kubrick. On recent systems, the live USB just refused to boot. Even a 2015 laptop didn't work. However, it worked flawlessly on a 2010 ThinkPad (the T410s).

qadzek · 11-02-2025, 01:49 PM

If anyone else encounters the same issue, apparently the K4 requires the latest firmware (4.1.4) in order for KUAL to work.
I also had to register my Kindle to prevent this error: Menu button > Settings > Registration. This requires an Amazon account.

LunarEclipse · 11-03-2025, 04:56 PM

I developed a fix for this without registering, see this thread https://www.mobileread.com/forums/sh...d.php?t=370520

You will need to enter airplane mode and reinstall the updated DevCerts first, then run the block script, and after that you can disable airplane mode and it won't get this issue again.

There will be a v1.0.1 of the linked mod soon which has a working unblock script if you ever need that.

03-24-2023, 07:06 AM	#1
superpomme Enthusiast Posts: 42 Karma: 100218 Join Date: May 2021 Device: kobo touch, k3, k4, Nook Simple touch	This device is not authorised as a test kindle Hi, I was wondering if anyone can help me. I got a k4 set up with the jailbreak, mkk, usb networking, kual, and python3, and I set it to auto load ssh on boot. Everything was working fine and then I tried to get it to connect to wifi, but it was refusing. I went into usb networking and set it to use a unique mac, and the wifi then connected, however now it is refusing to load kual stating "This device is not authorised as a test kindle" I tried a reboot, a hard reboot, a reinstall of the jailbreak, reinstall of mkk but it is still doing the same. k4 silver, with the version showing 4.1.4. Note that this isn't registered - is that needed? I do still have ssh access to it - is there any way to get kual working again? Thank you Last edited by superpomme; 03-24-2023 at 07:15 AM.

03-24-2023, 09:17 AM	#3
superpomme Enthusiast Posts: 42 Karma: 100218 Join Date: May 2021 Device: kobo touch, k3, k4, Nook Simple touch	really sorry to spam this post, but that only seems to fix it for a while and then it blocks it again. Is there something I'm missing here? I have other ones that are working fine on wifi without getting blocked. Thanks -> I tried blocking the kindle wan access, but doing so looks to then block the device from working over wifi too. I note that the kindles that aren't giving me these issues are on 4.1.1 while the ones that are blocking me look to be on 4.1.4 - would this explain the disparity? -> for future reference - I used Kubrick which worked perfectly, and was able to downgrade to 4.1.1 which doesn't have the same issue. All working great now. Last edited by superpomme; 03-28-2023 at 04:41 PM.

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03-24-2023, 08:03 AM	#2
superpomme Enthusiast Posts: 42 Karma: 100218 Join Date: May 2021 Device: kobo touch, k3, k4, Nook Simple touch	Sorry - I got it working! For the record, I was being dumb, and left the wifi on, so each time I reinstalled mkk, it then updated and blocked it. Turned off wifi installed mkk again helper+ -> "prevent OTA updates" (I had clicked the prevent ota earlier, but while in usbnetworking mode so it hadn't installed) Thanks. Can I mark this thread resolved?

04-06-2023, 01:06 PM	#4
mattcd216 Enthusiast Posts: 29 Karma: 10 Join Date: Jan 2023 Device: kindle 4 D01100	Any luck with this? Same for me - keep trying mkk install, but every time wifi turns on I get the error message when trying to use kual. matt

05-14-2023, 07:54 AM	#5
superpomme Enthusiast Posts: 42 Karma: 100218 Join Date: May 2021 Device: kobo touch, k3, k4, Nook Simple touch	sorry, didn't see your reply. Yea the fix was to downgrade the kindle firmware using Kubrick

07-10-2023, 07:49 PM	#7
tubular Junior Member Posts: 5 Karma: 10 Join Date: Jul 2023 Device: K4	Edit: I managed to install KUAL. The trick was indeed to put the Kindle in airplane mode before reinstalling MKK. Thanks a lot for describing your solution, superpomme. I am still interested in a downgrade to 4.1.1 however, because you indicated this is only a temporary fix.

07-17-2023, 03:35 AM	#8
tubular Junior Member Posts: 5 Karma: 10 Join Date: Jul 2023 Device: K4	It turns out that was only a temporary fix indeed. The "This device is not authorized as a test Kindle by the developer of this item" error resurfaced. I don't know yet if it solves this issue, but finally I did manage to downgrade the firmware to 4.1.1 using Kubrick. On recent systems, the live USB just refused to boot. Even a 2015 laptop didn't work. However, it worked flawlessly on a 2010 ThinkPad (the T410s).

11-02-2025, 01:49 PM	#9
qadzek Junior Member Posts: 7 Karma: 10 Join Date: Apr 2024 Device: Kindle 4 NT, Kindle 3	If anyone else encounters the same issue, apparently the K4 requires the latest firmware (4.1.4) in order for KUAL to work. I also had to register my Kindle to prevent this error: Menu button > Settings > Registration. This requires an Amazon account.

11-03-2025, 04:56 PM	#10
LunarEclipse Junior Member Posts: 6 Karma: 10 Join Date: Oct 2025 Location: EU Device: Kindle K4B	I developed a fix for this without registering, see this thread https://www.mobileread.com/forums/sh...d.php?t=370520 You will need to enter airplane mode and reinstall the updated DevCerts first, then run the block script, and after that you can disable airplane mode and it won't get this issue again. There will be a v1.0.1 of the linked mod soon which has a working unblock script if you ever need that.

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