Last update deleted my iPhone data what should I
I lost my iPhone data after updating is there a way to restore my iPhone to one month or three weeks a go ??????
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The only way you can do that is if have created a backup on iCloud and/or your computer. The restore date is directly dependent upon the day and time that you created that backup.
If you have a backup on iCloud and you would like to restore your iPhone from that backup then here is how to do that-->>Restore or set up your device from an iCloud backup - Apple Support
If you have a backup on your computer and you would like to restore your iPhone from that backup then here is how to do that-->>Restore your iPhone, iPad, or iPod touch from a backup - Apple Support
If you do not have a viable backup anywhere then all you have is what is on that iPhone and, as you said, it may be inaccessible or deleted.
Axel F.