You bought a pack of 4 drivers, so you received:
- A fully equipped PCB, GRBL software already loaded and board tested on my machine
You will need to install and configure lightburn: Link to post
Then follow the assembly instructions to the letter in the article (installation part in the K40): Link to post
If your K40 is not equipped with a motorized bed, it is absolutely necessary to deactivate the homing by following the instructions in the same article (Z-axis adjustment section)
WARNING: the 4-engine setup is a little special and requires little adaptation of the card configuration to your needs
Take the time to follow each of these steps to make sure you don’t damage your machine or the shield!
Thank you again!