On Debian, you need to set permissions for the HID device, too:
KERNEL=="hidraw*", SUBSYSTEM=="hidraw", ATTRS{idVendor}=="0888", ATTRS{idProduct}=="4000", MODE="0664", GROUP="plugdev"
SUBSYSTEM=="usb", ATTRS{idVendor}=="0888", ATTRS{idProduct}=="4000", GROUP="plugdev", MODE="0664"
Then you need to trigger (i think) the systemd-udevd.service:
systemctl daemon-reload
udevadm control --reload-rules
udevadm trigger