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How to use apple recovery mode to reset a forgotten passcode
If you see one of following alerts, you need to erase your device.
"iTunes could not connect to the [device] because it is locked with a passcode. You must enter your passcode on the [device] before it can be used with iTunes." Or "You haven't chosen to have [device] trust this computer"
To do so, you'll first need to place your device in recovery mode. Find out how to do this in our How to get an iPhone, iPad or iPod touch in and out of recovery mode guide then come back and move on to the next step.
Click 'OK' on the message from iTunes stating the device is in recovery mode.

Now restore your device from iTunes.