Write ISO to USB

From a terminal, run diskutil list to get the target device node (/dev/disk<N>), convert the image to UDRW, unmount all volumes on the destination disk and and write the image to it:

ISO=Downloads/debian-10.9.0-amd64-netinst.iso
IMG="$ISO.img"
DEST=omitted
hdiutil convert -format UDRW -o "$IMG" "$ISO"
sudo diskutil unmountDisk "$DEST"
pv -beprt $IMG.dmg | sudo dd of="$DEST" bs=1m

Or, without pv for progress:

sudo dd if="$IMG.dmg" of="$DEST" bs=1m

References

• How to make a bootable USB stick from an ISO file on macOS
• How do you monitor the progress of dd