You could try this here for a start … Issues with the Updater and a solution … and in case it doesn’t work you could perhaps inquire further here … Fairphone 4 Android 12 to 13 Upgrade
You could try this here for a start … Issues with the Updater and a solution … and in case it doesn’t work you could perhaps inquire further here … Fairphone 4 Android 12 to 13 Upgrade