Tvheadend

hi to all,
i bought a dvb-t usb device and i want install it in my fedora,but i do not know how find firmware for it.
chipset of my device is 'Afatech AF9033' and i have driver for it on windows,anyone know where can i find firmware for it for linux??

----------------may be helpful---------------------
when i type 'lsusb' in terminal,res:
Bus 001 Device 002: ID 8087:8000 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 003: ID 04f2:b3f6 Chicony Electronics Co., Ltd HD WebCam (Acer)
Bus 002 Device 004: ID 04ca:300b Lite-On Technology Corp. Atheros AR3012 Bluetooth
Bus 002 Device 010: ID 048d:9006 Integrated Technology Express, Inc. IT9135 BDA Afatech DVB-T HDTV Dongle
Bus 002 Device 008: ID 13fe:4200 Kingston Technology Company Inc.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
when i type 'dmesg | grep DVB-T' in terminal,res:
[ 364.107594] usb 2-2: DVB: registering adapter 0 frontend 0 (Afatech AF9033 (DVB-T))...
[ 3675.105530] usb 2-2: DVB: registering adapter 0 frontend 0 (Afatech AF9033 (DVB-T))...
[ 3764.151112] usb 2-2: DVB: registering adapter 0 frontend 0 (Afatech AF9033 (DVB-T))...
[ 3980.993878] usb 2-3: DVB: registering adapter 0 frontend 0 (Afatech AF9033 (DVB-T))...
[ 3992.468649] usb 2-2: DVB: registering adapter 0 frontend 0 (Afatech AF9033 (DVB-T))...