I don’t have this printer, but the Ender 3 1st Gen. So here are some suggestions for things, I’ve noticed on mine.
NTFS doesn’t work. So did you format the SD card with FAT32?
Is your SD card maybe too big and did you try smaller cards, with 4GB capacity for example?
Depending on your PC and the Mainboard of the CR10 you might need an FTDI driver to get it work. Did you check, if your OS recognises the printer in the device manager (Windows) or with lsusb (Linux)?