You need the "dvb-usb-it9135-01.fw" Firmware. Copy the Firmware to /lib/firmware and restart your computer

https://github.com/OpenELEC/dvb-firmware
https://github.com/OpenELEC/dvb-firmware/tree/master/it9135

http://www.linuxtv.org/wiki/index.php/ITE_IT9135

Modul: dvb_usb_it913x

Producer: Integrated Technology Express, Inc.
Chip: IT9135 BDA Afatech