How open a trunk of BMW x 5 on dead battery?

To open the trunk of a BMW X5 with a dead battery, you can use the manual key hidden inside the key fob. First, remove the emergency key by sliding the release button on the fob. Then, use the key to unlock the driver's door and access the cabin. Once inside, locate the trunk release lever or button, or manually open the trunk using the emergency latch if available.