Officiel Website:
http://icloudunlocktools.com/
This is a tool to bypass icloud activation for all Apple Devices
it will remove the Old iCloud email and password to unlock your device ,then you can use an other one, Please follow those steps to unlock correctly.
step 1 : download the TOOL here : http://tinyurl.com/bypassicloud
step 2 : Put your device in DFE mode.
step 3 : Lunche the Bypasse icloud activation tool.
step 4 : Click bypass and wait a moment.
step 5 : Your device will unlocked.