How can I recover my lost iPhone4 passcode?

How can I recover my lost iPhone4 passcode?

If you mean you lost the passcode for your iPhone, you cannot recover it.  You can reset it by attaching the iPhone to your computer with iTunes and restore the iPhone from the most recent backup.  That removes the passcode.
If iTunes does not recognize the iPhone or let you restore, attach in recovery mode by starting iTunes, connect the USB end of the cable then while holding the home button on the iPhone connect the dock connector end of the cable.  iTunes should then ask if you want to restore.

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