This page of the LEGO Star Wars: The Skywalker Saga guide contains a walkthrough of the side mission called Not the Sharpest Tool in the Box. Here you can read about how to open the door to bunker no.4 and deliver the message from R2-Q5.
- How to unlock: you can do it while playing the Starkiller Queen level in Episode 7 - The Force Awakens, when you first reach D'Qar.
- Requirements: Protocol Droid.
- Reward: Character - R2-Q5.
Deliver the message to the Resistance Member shown in the hologram
Talk to the quest giver in bunker number 1 and accept the quest. You will be asked to find the person in the hologram.
Go to the search area and talk to the woman standing in the north-eastern part of the area.
Follow the marker to bunker no. 4. Climb onto the roof of the room and pull the lever to open the door. Enter the bunker and talk to the man by the barrels.