reset old iphone
how do i reset an older iphone while still having the new one on.
iPhone 8 Plus
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What type of reset do you want to do?
For a full reset to make the phone like 'new', use the steps in the article below.
Or a factory reset? Do a backup and try a factory reset. Then restore from your backup.
Restore - If you see an error when you update or restore your iPhone, iPad, or iPod. *
Backup - Restore your device from an iCloud or iTunes backup. *