How do I upgrade from Android version 9 to a higher major version?

/e/OS Devices Fairphone
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How do I upgrade from Android version 9 to a higher major version?
My version now is:
/e/OS 0.23-20220406176461
Android 9
6 april 2022 (last update)

I can’t find a manual to do this.
Please, Is there anyone with a little bit more experience than I have?

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

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This reference shares a build date and build ID with e-0.23-p-20220406176461-stable-FP3.

  • (You have a Fairphone 3? assuming yes …)

You will really need to treat this as a new install, to include Format data. So backing up essentials is a prerequisite.

You could consider one of these:

You can install stable Android 13 (T). The install is done with a script (which will perform the Android version upgrade) packaged with the download. https://images.ecloud.global/stable/FP3/

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https://doc.e.foundation/support-topics/backup-and-restore-ephone

I heard some people wrote the appliication data can’t be restored, careful about it

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