K4 FW 4.1.4, KUAL/MRPI problems

SpuntoTheRatBoy · 04-15-2025, 08:46 AM

Hello all,

I've got my K4 jailbroken (is that the correct participle?), I've got MKK and Python installed and screensavers working properly so I can use an image of my own creation, or use the cover of the last book.

I can't seem to get KUAL or MRPI working.

Following the instructions in the Install "KUAL itself" spoiler here it looks like I need to copy KUAL-KDK-1.0.azw2 from the legacy/non-coplate version in KUAL-v2.7.35-g2d06358-20250103.tar.xz into my documents, and then click on the resulting document in my library. But when I do that, I get an error:

An error occurred: Main class instantiation threw a RuntimeException. Please contact the developer.

I've also tried using the Booklet from the same tarball, Update_KUALBooklet_v2.7.35_install.bin in the USB root of the Kindle — the machine then claims to update successfully, but I can't see any difference once it restarts. And I also tried the corresponding file from the coplate version, KUAL-18b218e-20250103/Update_KUALBooklet_18b218e_install.bin, just in case, but the same thing happens. Should I be trying them in the mrpackages directory instead? But I think if KUAL isn't working then MRPI isn't either, right?

I've tried doing the ;log mrpi thing at various points in this process, and it's never done anything at all.

I wonder if maybe I have correctly installed KUAL, but I just can't find how to start it, and I'm flapping about like an idiot missing the obvious! I don't seem to have a Home screen distinct from the library, so the only menus I have are what I get when I click the physical menu button. I tried installing the KUAL Helper menu, and Ko Reader, and either they're not installed or I just can't see them.

The RuntimeException makes me think KUAL just isn't installed properly, though.

If anyone can see anything obvious that I'm doing wrong, or anything I should be checking or looking out for, I'd be really grateful for your help.

Thanks!

OctopusET · 04-18-2025, 07:42 AM

I have exactly same issue with you

Spezi · 04-23-2025, 01:24 PM

Similar issue here.

Jailbreak works using NiLuJes K4 1.8N version. Installing MKK from the same page works as well, but after that I am stuck.

I cannot open the KUAL document on my kindle, nor can I update it via the supplied .bin.

SpuntoTheRatBoy · Today, 03:46 AM

Thanks for replying, everyone! I'm sorry it's happening to other people — if it were just me then I'd be doing somethiing stupid, everyone would laugh at me and then they'd tell me how to fix it. But this makes me think something trickier is going on

I'm going to post on the Kindle modding subreddit and see if anyone has any ideas there. If I hear anything I'll let you know.

04-15-2025, 08:46 AM	#1
SpuntoTheRatBoy Junior Member Posts: 3 Karma: 10 Join Date: Apr 2025 Location: Brighton, England Device: Kindle Kindle4NonTouchBlack	FW 4.1.4, KUAL/MRPI problems Hello all, I've got my K4 jailbroken (is that the correct participle?), I've got MKK and Python installed and screensavers working properly so I can use an image of my own creation, or use the cover of the last book. I can't seem to get KUAL or MRPI working. Following the instructions in the Install "KUAL itself" spoiler here it looks like I need to copy KUAL-KDK-1.0.azw2 from the legacy/non-coplate version in KUAL-v2.7.35-g2d06358-20250103.tar.xz into my documents, and then click on the resulting document in my library. But when I do that, I get an error: An error occurred: Main class instantiation threw a RuntimeException. Please contact the developer. I've also tried using the Booklet from the same tarball, Update_KUALBooklet_v2.7.35_install.bin in the USB root of the Kindle — the machine then claims to update successfully, but I can't see any difference once it restarts. And I also tried the corresponding file from the coplate version, KUAL-18b218e-20250103/Update_KUALBooklet_18b218e_install.bin, just in case, but the same thing happens. Should I be trying them in the mrpackages directory instead? But I think if KUAL isn't working then MRPI isn't either, right? I've tried doing the ;log mrpi thing at various points in this process, and it's never done anything at all. I wonder if maybe I have correctly installed KUAL, but I just can't find how to start it, and I'm flapping about like an idiot missing the obvious! I don't seem to have a Home screen distinct from the library, so the only menus I have are what I get when I click the physical menu button. I tried installing the KUAL Helper menu, and Ko Reader, and either they're not installed or I just can't see them. The RuntimeException makes me think KUAL just isn't installed properly, though. If anyone can see anything obvious that I'm doing wrong, or anything I should be checking or looking out for, I'd be really grateful for your help. Thanks!

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04-18-2025, 07:42 AM	#2
OctopusET Junior Member Posts: 3 Karma: 10 Join Date: Apr 2025 Device: Kindle 5th	I have exactly same issue with you

04-23-2025, 01:24 PM	#3
Spezi Junior Member Posts: 1 Karma: 10 Join Date: Apr 2025 Device: K4 silver no touch	Similar issue here. Jailbreak works using NiLuJes K4 1.8N version. Installing MKK from the same page works as well, but after that I am stuck. I cannot open the KUAL document on my kindle, nor can I update it via the supplied .bin.

Today, 03:46 AM	#4
SpuntoTheRatBoy Junior Member Posts: 3 Karma: 10 Join Date: Apr 2025 Location: Brighton, England Device: Kindle Kindle4NonTouchBlack	Thanks for replying, everyone! I'm sorry it's happening to other people — if it were just me then I'd be doing somethiing stupid, everyone would laugh at me and then they'd tell me how to fix it. But this makes me think something trickier is going on I'm going to post on the Kindle modding subreddit and see if anyone has any ideas there. If I hear anything I'll let you know.

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