HPE ProLiant DL385 Gen10 Plus v2 Maintenance And Service Manual page 112

2. Use a screwdriver to loosen the three captive screws in the sequence shown and then pivot the force frame up.
3. Remove the external cap.
a. Hold the lift tabs near the front end of the rail frame, and then pivot the rail frame to the vertical position.
b. Slide the external cap out of the rail frame.
Retain the external cap for future use.
4. Install the processor:
a. Hold the processor by its carrier handle and slide the processor into the rail frame until it engages with a click sound.
HPE ProLiant DL385 Gen10 Plus v2 Server Maintenance and Service Guide 112