r/Kindlemodding

Hi all, I'm trying to jailbreak an old Kindle 8th generation (firmware 5.16.2.1.1, Italian UI) and I'm stuck. I followed the KindleModding.org wizard, which recommended WinterBreak 2.

What I did:

Filled the Kindle's storage with the filler script (PowerShell on Windows), as the guide says, to block auto-updates.

Downloaded WinterBreak 2 and extracted it onto the Kindle.

Ejected the Kindle, connected it to Wi-Fi, opened the built-in experimental browser and went to the WinterBreak URL.

Pressed the Jailbreak button and waited.

After that I removed the filler files and rebooted.

What happens:

At the end the browser shows a "Download file" popup saying it downloaded script%3EWinterbreak2.mobi. After that nothing else happens, and I don't find any new book in my library (I checked with "All" and by searching "winter" and "script").

Typing ;kpm update or ;kpm install koreader in the search bar does nothing. It just runs a normal search with 0 results.

The guide's next page says KUAL is obsolete and to use KPM from the search bar, but it doesn't mention any hotfix step.

Questions:

Is the .mobi download normal for WinterBreak 2, or does it mean the exploit failed?

Am I supposed to open that file from the library? Do I need to do anything after pressing the Jailbreak button?

Is there a way to check whether the jailbreak actually worked (e.g. ;log)?

Could the 5.16.2.1.1 firmware need a different method?

Thanks in advance for any help!