I own the Ender 3 Pro BUT,
I have the silent motherboard 32-bit and installed with the firmware: "Ender-3 Pro_HW4.2.7_SW2.0.9.03_SpritExt_H300" because it seems like its the only one meant for the extruder pro kit. It complains that the BL-Touch is not attach to it. I can see it in Octoprint error message and gcode terminal.
With the default firmware on it, it did manage to start the print till its heated to 228°C, but Octoprint couldn't proceed after the printer heated. It just waited till infinity.
Additionally the Display is not working at all, its beeping and mid beeping a louder beep is repeating every second. Not sure why, but the display claims to support Ender 3 Pro, Ender 3 and Ender 3 v2.
More Sources:
What firmware would be the correct one for the extruder? Should I return the Display?
Silent Mainboard did work with the stock-extruder. It stopped working with Octoprint after replacing the extruder with the new one, but seems to heat and move correctly.
Nope, thats a different topic.