Unlock iphone 12

Click here and follow the instructions. Restoring the iPhone requires plugging it into a computer with iTunes installed, or a Mac running Catalina or newer.

If there's an option to erase it, you can use that instead.

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Did you follow all of the steps in the support article that Niel has provided you? If so, at what step did it fail?

Here is that article again: If you forgot your iPhone passcode - Apple Support