Hello,
I successfully jailbreaked my Oasis2 (KOA2 9th gen).
I did it with my Mac (MacOS Sequoia) for people who would wonder if it work with a Mac.
After many many attempts with the normal method, I used the oneclick method and it worked directly. I should have started with this method which is so easier.
Thank you @Marek for your amazing work.
But I need some help: Now, Im stuck with a managed device.
The first post tells to type ;demo but when I do that, yes it asks confirmation (everything is in English btw), I click yes, It reboots, but comes back in the same managed situation after reboot.
EDIT: solved with a factory reset !
Now I've installed KUAL, python, librariansync, and the Kindle Collections plugin on my Calibre. Managing my collections has never been so easy and clean

guys