BlackDoor provides two series, first series looks like iOS 4/5/6 and second series looks like iOS 7/8.

Both series are in two versions: Normal and Unlocked.

Select BlackDoor Normal version if you can legitimately activate you device via iTunes and you don’t need carrier unlock.
If your device is factory unlocked or you are using iPhone with the official carrier that sold you the device.
All other users should choose BlackDoor Unlocked firmwares because they need carrier unlock.
BlackDoor unlocked firmware need Push Notifications patch after the installation. Recommended visit pushfix.info but you can also visit others.

If you want look on list of features BlackDoor custom iOS firmware, click here.