It's been a while since I had my deltas doing any work but with the Covid-19 PPE shortage I needed a machine large enough to print face shields and that is my Almost Mini Kossel with the 340mm diameter.
I needed to update the firmware because it would stall for a moment and leave little blobs in the side of the print and when that's against a forehead, it's not good.
So I dug though my directories, found my Marla1.04 with my calibration notes in the file( M66 commands ) but just in case I ran M503 and saved those settings.
I turned off the SD card and the LCD display and uploaded the firmware but now when I send G28 it'll go up and then not stop trying to go up. But if I power cycle the
machine and then send G28 it will home normally that one time.