FTDI module crash? 7390 and usb problem

hello,

pls tell me, if is possible run ftdi device without freetz in stock FRITZ!Box Fon WLAN 7390 Firmware: FRITZ!OS 05.22 (intl) - latest intl version of stock firmware

i try:
insmod /lib/modules/2.6.28.10/kernel/drivers/usb/serial/usbserial.ko
insmod /lib/modules/2.6.28.10/kernel/drivers/usb/serial/ftdi_sio.ko

after this, /dev/ttyUSB0 and /dev/ttyUSB1 is added for my attached ftdi device,

but after i access to this devicess, fbf crash - reboot :-(

have anyone experience with this version of .ko modules?
any tip for solution?
___
here is /lib/modules/2.6.28.10/kernel/drivers/usb/serial content (embedded into stock firmware):
-rw-rw-rw- 1 root root 80704 Apr 24 2012 ftdi_sio.ko
-rw-rw-rw- 1 root root 20660 Apr 24 2012 option.ko
-rw-rw-rw- 1 root root 56256 Apr 24 2012 usbserial.ko


or have anyone different version of ftdi modules or pl2303 modules or hl340 modules? i want try load from flash storage

nobody try ftdi river on FBF?

i try different ftdi - com cable and same case