hi i need help with my kossel deta printer i bought it and it came with a usb and you had t fash the board wiht marlin.ino but they customized spcifcaly for these types f printers so it would work for kossel delta printer but they must have for got some things and it wont let me flash the board until it is fixed but i dnt know hw t fix it

I’m assuming it’s a ramps/mega setup. Did you download the appropriate drivers/program to access the arduino mega board?