Reset Passcode without Losing Data
Iphone 8 is not recognising 6 digit Passcode - how to reset without losing data
iPhone 8, iOS 13
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You can't reset without losing data. From the article below.
If you backed up your device, you can restore your data and settings after restoring your device. If you never backed up your device before you forgot your passcode, you won't be able to save the data on your device.