forgeting passcode
how can i unluck my iphone without erasing datas and without having a backup
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If you forgot your passcode, you have to erase the phone. You will not be able to save the data on the iPhone.
This is why backups are so important.
If you forgot your iPhone passcode - Apple Support
If you're running iOS 15.2 or later, might be able to do it without a computer
How to remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support