||The BD unit designated BD-1 was an masculine-programmed exploration droid that accompanied Jedi Master Eno Cordova on the Jedi's journey to explore the history of the Zeffo. Cordova later realized that they were in danger, and programmed BD-1's memory to be blocked, only revealed by someone the droid trusts. BD-1 then remained on Bogano in the vicinity of the Zeffo Vault until 14 BBY, when the Padawan Cal Kestis, a survivor of Order 66, arrived on the planet at the behest of Cere Junda in order to find a holocron key to rebuilding the Jedi Order. Kestis quickly gained the support of BD-1, and they entered the vault. Along the way, the droid's scomp link was broken by the local wildlife. Unable to unlock the deepest reaches, Kestis took the droid back to his starship and crew, the Stinger Mantis. They then traveled to other worlds on their quest to uncover the secrets of the Vault and that of the Zeffo. BD-1 scanned other Zeffo artifacts, showing recordings of Cordova to Kestis. When they were confronted on Zeffo by the Second Sister, BD-1 activated a force field between the combatants, saving Kestis' life. During their journey, Kestis upgraded BD-1 with several different gadgets to assist them, and also repaired the scomp link. During their exploration of Zeffo, Kestis was stunned by a Haxion Brood droid bounty hunter, and both he and BD-1 were imprisoned on Ordo Eris. Kestis broke them both out, and they were rescued by the Mantis. Following a Force vision on Dathomir that left the Jedi's lightsaber damaged, they traveled to Ilum for a new kyber crystal. After battling Imperial forces guarding the cave, Kestis finally acquired a new crystal, only for it to break in his hands. The Padawan almost gave in to despair, but with BD-1's support, rallied and completed his new lightsaber. BD-1 was then able to unlock his memory, showing the recording of Cordova. Kestis then returned to Bogano and gathered the holocron, but it was stolen by the Second Sister, and the Mantis crew followed her to the Fortress Inquisitorius. BD-1 traveled underwater with Kestis to the fortress. They recovered the holocron, but were confronted by Darth Vader. The droid charged the Sith Lord and delivered a shock, but Vader shrugged it off. They only escaped by breaking the tunnel and escaping in the onrush of water.