install TBS 5520SE on RPi3 with LibreELEC 8.2.3

    Hi to everyone, I have used with success a Rpi 3 with a dvb-t usb receiver Avermedia volar green hd with HTS Tvheadend 4.2.3-20 on librelec 8.2.3.

    I used it as pvr station and media server and it work fine.

    I recently bought a tbs 5520se card, but how do I install it on this platform?

    I connected the Y cable to 2 usb ports and system recognize it.

    Code
    LibreELEC:~ #  lsmod |grep dvb
dvb_usb_tbs5520se       6887  0
dvb_usb                15211  1 dvb_usb_tbs5520se
dvb_core               76172  1 dvb_usb
rc_core                20369  1 dvb_usb
    Code
    [   72.475785] dvb-usb: found a 'TBS 5520se USB2.0' in cold state, will try to l                                                                               oad a firmware
[   72.476181] usb 1-1.2: Direct firmware load for dvb-usb-tbsqbox-id5521.fw fai                                                                               led with error -2
[   72.476189] dvb-usb: did not find the firmware file. (dvb-usb-tbsqbox-id5521.                                                                               fw) Please see linux/Documentation/dvb/ for more details on firmware-problems. (                                                                               -2)
[   72.476555] usbcore: registered new interface driver tbs5520se

    dmesg said that firmware is missing so i downloaded crazycat firmware pack and put dvb-usb-tbsqbox-id5521.fw in the /storage/.config/firmware folder and reboot

    the problem is that after reboot the system crash... with tbs 5520se plugged to usb no way to have normal boot.

    how I can solve this?

    thanks.