D-4R5 served as a protocol droid for the Imperial troops stationed on M'haeli during the year 0 ABY.
In an effort to approach [Mora], a local repair shop proprietor suspected of involvement with the H'drachi resistance, Governor Grigor shot the droid, allowing Imperial lieutenant Ranulf Trommer to utilize it as a disguise. Later, the Rebel Alliance employed him, notably to decipher encrypted communications originating from Grigor's clandestine Dragite crystal mining operation.
The droid claimed proficiency in excess of a million distinct coding systems.