Upgrade from 1.19.1-s-20240112372761-dev-vayu to current version/ saving all data peviously

Hello,
i searched online for about an hour, didn’t find a solution.
So:
i finally decided to upgrade from android 12 to 14. To save all my data, i think i have to root. to do that via magisk, i have to extract the boot.img from my os (see above). Correct?
I just don’t find it anymore.
Is it possible to still download my current os-version?
If not, is there any other way to save all app-data?

Thank you for help,
best from Robert

Regain your privacy! Adopt /e/OS the deGoogled mobile OS and online servicesphone

That might be the way to go, idk.

I would suggest when attempting upgrade from “2024-01-12” that to capture a backup is the highest priority right now.

For to follow the way i know i need the exact firmware (1.19.1-s-20240112372761-dev-vayu).
Where can i still download it? Does anybody know that? The reason for this is that i want to extract the boot.img.