Sideload. My data, settings and apps were carried over. As to the bootloader question, I helped a local Fairphone 3 user (who permanently rents the phone from Commown) to upgrade his FP3 from Android 10 (stable) to Android 13 (official) last week. We did not need to change the bootloader status (it was locked) to upgrade from 10 to 11 and from 12 to 13 (via ADB sideload; the upgrade from 11 to 12 was possible through the Updater).
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