Unlocking iPhone with forgotten passcode
One attempt left,cant remember number, please help to sort this out on my iPhone,Thanks.
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If you enter the correct passcode, all will be well. If the last attempt fails, then you will have to reset / erase the phone and then set it up again. If you have a current backup of the phone, you can restore the phone's data so the phone will look just like it did before you forgot the passcode.
It's really old fashioned, but it might still be a good idea to write down the new passcode and keep it in a safe place in your desk.......even if you are sure that you will never forget it.
If you forgot your iPhone passcode or your iPhone is disabled - Apple Support