For F1620:

After change P00 to Recovering factory parameters, those parameters changed:

(if Cannot see P00, need to change U03 to 1 (ONLY), instruction https://youtu.be/FXzIYt-fCgQ )

P: keep all default
H: keep all default

L01: 1
L02: 0 (Default)
L03: 0 (Default)
L04: 0 (Default)
L05: 0 (Default)
L06: 0
L07: 0
L08: 0 (Default)
L09: 1

---

L09: (Change Limit Switch Type, Wrong Setting May Cause Collision Error)
  0: Limit Switch is NC
  1: Limit Switch is NO

============================================

For Z2020:

Reset to Factory Default: Press "ENTER" and "-" (MINUS) Same Time, Then Press "+" (PLUS) to Confirm.
(No prompt, just reboot after this sequence)

P09: (Change Limit Switch Type, Wrong Setting Cause E5)
  0: Limit Switch is NO
  1: Limit Switch is NC

If THC Motor (That Move Torch Up/Down) in Reverse Direction:
Swap Wire of "2.4 MOTOR1" and "2.5 MOTOR2"