Unjailbreak iPhone 4 5.1.1 restore

I have an iphone 4 jailbroken on iOS 5.1.1 recently my girlfriend changed my passcode to a alphanumeric passcode and forgot it. I want to restore my phone or somehow bypass the passcode and just delete it all together. Is there anyway to do this? Also my power/lock button is broken.

Just plug it in, open iTunes and click the restore button…

Now you r done…

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