Have a look here: https://discussions.apple.com/thread/256078060?sortBy=rank
and here: https://support.apple.com/en-us/108763
But I would be cautious without a backup.
So, you may also wait (a couple of months) for an iOS 26 release and upgrade at that time. Your data should be safe.
Then, don't forget to make a backup.
Topic:
Community
SubTopic:
Apple Developers
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