The following is in /usr/local/etc/devd/hardware_wallet.conf
# Coldcard MK3
notify 301 {
match "system" "USB";
match "subsystem" "DEVICE";
match "vendor" "0xd13e";
match "product" "0xcc10";
match "type" "ATTACH";
action "/bin/chmod g=rw /dev/$cdev";
};