How to restore from previous day

If you are doing regular iCloud or iTunes backups, you can erase your device, and then select a backup to restore from:

How to erase your iOS device - Apple Support

Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

Best,

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If you have been doing manual backups, connect your phone to the computer and in iTunes, click on the phone icon at top left, then on Restore backup.