I have the exactly same laser that runs flawless with a rambo V1.4 board but does not wanna work with a SKR 1.4 , 1.4 Turbo or SKR pro 1.2
What did you change in the Firmware? and what laser control board did you use? (mine came with 2 different boards one with a lcd and a very simple one with 3 ways to connect 12V, GND and TTL )