udev rules dos not apply

I have a usb radio card (bladeRF).


2017-05-03T19:22:39.429240+02:00 andromeda kernel:   784.333303] usb 2-3: new high-speed USB device number 4 using ehci-pci
2017-05-03T19:22:39.544227+02:00 andromeda kernel:   784.449096] usb 2-3: New USB device found, idVendor=1d50, idProduct=6066
2017-05-03T19:22:39.544251+02:00 andromeda kernel:   784.449103] usb 2-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
2017-05-03T19:22:39.544252+02:00 andromeda kernel:   784.449106] usb 2-3: Product: bladeRF
2017-05-03T19:22:39.544254+02:00 andromeda kernel:   784.449108] usb 2-3: Manufacturer: Nuand
2017-05-03T19:22:39.544255+02:00 andromeda kernel:   784.449110] usb 2-3: SerialNumber: 491b97c8e44162b694e6e41213108b27

I have added udev rules


andromeda:/home/fernando # cat /etc/udev/rules.d/88-bladerf.rules
# Nuand bladeRF
ATTR{idVendor}=="2cf0", ATTR{idProduct}=="5246", MODE="660", GROUP="users"

# Nuand bladeRF, legacy VID/PID
ATTR{idVendor}=="1d50", ATTR{idProduct}=="6066", MODE="660", GROUP="users"

# Cypress Bootloader
ATTR{idVendor}=="04b4", ATTR{idProduct}=="00f3", MODE="660", GROUP="users"

I have rebooted the system, but udev rules do not work, the card is recognized under /dev/bus/usb/002/005, but with root.root permissions


andromeda:/home/fernando # ls -l /dev/bus/usb/002
total 0
crw-rw-r-- 1 root root 189, 128 May  3 19:09 001
crw-rw---- 1 root root 189, 132 May  3 19:25 005


I can use it as root, but not as a normal user.

What am I doing wrong?

Opensuse 13.2 x64

regards