PalosX

don't change the firmware name. It doesn't recognize it, use the name it is made with firmare.bin. Did the same thing took forever to figure out

Insert sd card with boartd off then power up. What a minute then check if file extension changed to CUR.

You have to use a boot loader watch these to videos sorry not a bootloader a writer https://www.youtube.com/watch?v=NGgzw-XayEo https://www.youtube.com/watch?v=wpZq2_nD0Ho https://www.aliexpress.com/item/2255800313891542.html?spm=a2g0o.detail.1000060.1.63f76877FBsFeI&gps-id=pcDetailBottomMoreThisSeller&scm=1007.13339.274681.0&scm_id=1007.13339.274681.0&scm-url=1007.13339.274681.0&pvid=a4d35025-9b96-4455-95f8-bb64cff34ebc&_t=gps-id:pcDetailBottomMoreThisSeller,scm-url:1007.13339.274681.0,pvid:a4d35025-9b96-4455-95f8-bb64cff34ebc,tpp_buckets:668%232846%238110%231995&pdp_ext_f=%7B%22sku_id%22%3A%2210000002328850465%22%2C%22sceneId%22%3A%223339%22%7D&pdp_npi=2%40dis%21USD%21%213.14%21%21%21%21%21%40210323a216587881839868463eb78d%2110000002328850465%21rec

Hell I can't believe there's not one damn you-tube video for the probe and Marlin set-up. I can't get mine to work in Z homing starts going done then kills...