K4 Dev Certs reset by Amazon when connecting to the Internet

poweruser · 08-12-2025, 05:10 PM

I just have jailbroken my kindle k4 No Touch (black) and set up KUAL and KOreader.

First of all I want to thank all of the people contributing to this community. The support seems amazing and I'm glad to have found such an active and independent forum.

It all went smoothly with the detailed instructions from the sticky posts.

When connecting my kindle to the wifi after setting up everything I hit a problem though. A new document appeared at the very homepage, an amazon notice stating "Dear developer, Your kindle is no longer a test device.. You cannot access dev signed booklets from now.", leaving me unable to open the KUAL booklet. ("Not authorized, contact devs, bla.."
As I flashed the 2025 updated def certs before, I did just that, with no success. A new notice appeared, same timestamp, different content. I still couldn't open KUAL with the same error message as before.
When I entered flight mode and went through the same procedure, I could now access the booklet again.

So appearantly amazon will just always remove your appropriate keys when finding your kindle connecting to their network.

I don't need internet access right now, but when I do, I am left with dns blocking amazon in my network? A solution would be appreciated.

+ My FW is 4.1.3 and did not change troughout this problem and should be blocked to do so by the prevent backdoorfw update extension.

shamanNS · 08-13-2025, 07:57 AM

Is your K4 registered to Amazon account?
I somewhat recall that somebody mentioned that they fixed this problem by making those keystore files (or the whole directory?) immutable (chattr +i ).

Quoth · 08-13-2025, 01:56 PM

Quote:

Kindle (4th and 5th Generation)
Latest version: 4.1.4

A long time since Amazon updated FW on the 4NT
https://www.amazon.com/gp/help/custo...MQC26VQQMM8XSW

Frogm4n · 08-13-2025, 07:05 PM

Quote:

Originally Posted by poweruser

+ My FW is 4.1.3 and did not change troughout this problem and should be blocked to do so by the prevent backdoorfw update extension.

It's been noted quite often that only the latest firmware on these old Kindles works correctly with the new Dev Certs. As Quoth pointed out, the latest for your device is 4.1.4.

poweruser · Yesterday, 09:18 PM

Okay thanks a lot for your replies, I now upgraded to FW 4.1.3, Factory Reset and applied JB + MKK again. And I got KUAL again.
Amazon would still remove the DevCerts, so I installed MKK in flight mode. Now I want to try to make the keystore immutable, so i can use the network again.
I am not very handy with terminal emulation so I have a few questions first.
This post from the available Kindlets list suggested KindleTERM as a kindle 4 ssh client terminal emulator. So I guess I can use it to SHH into localhost from my kindle and change the keystore permissions to immutable. From reading the comments on the KindleTERM post I am not sure if the keyboard will work on the NT 4 though. Also Hawhill made a version that would connect to localhost automaticly, but it uses telnet so maybe I net to setup the appropriate usbnetwork hack first?
Also do I need to merge the KindleTERM keystore with the mkk one once I get a terminal session running? Or is it already part of the unified keystore?
Please tell me if theres an easier way to do this, this all seems scary to me. :
Oh and my kindle is not registered with an amazon account.

08-12-2025, 05:10 PM	#1
poweruser Junior Member Posts: 2 Karma: 10 Join Date: Aug 2025 Device: Kindle k4 NT	Dev Certs reset by Amazon when connecting to the Internet I just have jailbroken my kindle k4 No Touch (black) and set up KUAL and KOreader. First of all I want to thank all of the people contributing to this community. The support seems amazing and I'm glad to have found such an active and independent forum. It all went smoothly with the detailed instructions from the sticky posts. When connecting my kindle to the wifi after setting up everything I hit a problem though. A new document appeared at the very homepage, an amazon notice stating "Dear developer, Your kindle is no longer a test device.. You cannot access dev signed booklets from now.", leaving me unable to open the KUAL booklet. ("Not authorized, contact devs, bla.." As I flashed the 2025 updated def certs before, I did just that, with no success. A new notice appeared, same timestamp, different content. I still couldn't open KUAL with the same error message as before. When I entered flight mode and went through the same procedure, I could now access the booklet again. So appearantly amazon will just always remove your appropriate keys when finding your kindle connecting to their network. I don't need internet access right now, but when I do, I am left with dns blocking amazon in my network? A solution would be appreciated. + My FW is 4.1.3 and did not change troughout this problem and should be blocked to do so by the prevent backdoorfw update extension.

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08-13-2025, 07:57 AM	#2
shamanNS Wizard Posts: 1,124 Karma: 12345678 Join Date: Feb 2010 Location: Serbia Device: Kindle PW5, Kobo Libra 2, Kindle PW1	Is your K4 registered to Amazon account? I somewhat recall that somebody mentioned that they fixed this problem by making those keystore files (or the whole directory?) immutable (chattr +i ).

Yesterday, 09:18 PM	#5
poweruser Junior Member Posts: 2 Karma: 10 Join Date: Aug 2025 Device: Kindle k4 NT	Okay thanks a lot for your replies, I now upgraded to FW 4.1.3, Factory Reset and applied JB + MKK again. And I got KUAL again. Amazon would still remove the DevCerts, so I installed MKK in flight mode. Now I want to try to make the keystore immutable, so i can use the network again. I am not very handy with terminal emulation so I have a few questions first. This post from the available Kindlets list suggested KindleTERM as a kindle 4 ssh client terminal emulator. So I guess I can use it to SHH into localhost from my kindle and change the keystore permissions to immutable. From reading the comments on the KindleTERM post I am not sure if the keyboard will work on the NT 4 though. Also Hawhill made a version that would connect to localhost automaticly, but it uses telnet so maybe I net to setup the appropriate usbnetwork hack first? Also do I need to merge the KindleTERM keystore with the mkk one once I get a terminal session running? Or is it already part of the unified keystore? Please tell me if theres an easier way to do this, this all seems scary to me. : Oh and my kindle is not registered with an amazon account.