stty: /dev/ttyACM0: Inappropriate ioctl for device

This command on a Raspberry Pi 3: stty -F /dev/ttyACM0 ispeed 9600 ospeed 9600 raw Resulted in this error: stty: /dev/ttyACM0: Inappropriate ioctl for device This happened after the sd-card (with the OS) of the Pi entered failsafe mode so it is read only. I used dd to copy the 16GB sd-card to a new 128GB one: dd if=/dev/sdd of=/srv/iso/pi_20250928.iso dd if=/srv/iso/pi_20250928.iso of=/dev/sdd The…