How do I reduce system data storage on iPhone to update?

I can’t update my phone because my storage is too full. The system data is taking up more than half of my storage and I don’t know how to remove it. I’ve cleared my caches, deleted a ton of photos and restarted my phone. Not sure what else to do.




[Re-Titled by Moderator]

Original Title: System Data Issue

iPhone 15 Plus, iOS 26

Posted on Dec 3, 2025 11:34 AM

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Question marked as Top-ranking reply

Posted on Dec 3, 2025 2:24 PM

Three steps:

1) Start with a backup! Refer to Backup methods for iPhone or iPad - Apple Support

2) Erase the content on your device. Refer to How to factory reset your iPhone, iPad, or iPod touch - Apple Support

3) Restore your device from your backup. Refer to: Restore your iPhone, iPad, or iPod touch from a backup - Apple Support


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How do I reduce system data storage on iPhone to update?

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