sudo dd bs=1m if=source.img of=/dev/rdiskX
the key is to use rdisk instead of disk on output file name.
The last week I had some problem with the creation of a bootable usb dongle with kali linux. Here is the topic that help me to solve the problem
Today, after the update to version 6.1, Safari don’t start anymore. I think the problem was Glims plugin, after the upgrade of the plugin all work well.