Quote:
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 ... 
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my steps are the following and hope it can help others.
1. Freshly reset the device and mine is kindle paperwhite 2
2. Right now I am in 5.4.2, if not just degrade to this version
3. Now jailbreak,"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***
4. copy the latest .bin for K5 from DevCerts-20250419-KeyStore.zip, placed in root folder,again, settings > update
5. now, install MRPI using the file kual-mrinstaller-1.7.N-r19293.tar.
6. copy latest Kual from KUAL-v2.7.37-gfcb45b5-20250419.tar.xz and extract KUAL-KDK-2.0.azw2 and place in documents folder.
7.update kindle KPW1 to 5.4.5 using update_kindle_5.4.5.1.bin, you know how -> place in root folder then settings > update
8. install koreader and kpvbooklet.