Intel PRO/Wireless 5100AGN support

Hi,

I'm trying to use my wireless card Intel(R) PRO/Wireless 5100AGN.

I added to the file "/usr/src/sys/dev/iwn/if_iwn.c" the code "{ 0x8086, 
0x4237, "Intel(R) PRO/Wireless 5100AGN" },"

After, i found on the net the file "iwlwifi-5000-ucode-5.4.A.11.tar.gz" 
which contains the firmware code "iwlwifi-5000-1.ucode".
    
I have converted with the command: "b64encode iwlwifi-5000-1.ucode 
iwlwifi-5000-1.fw.uu > iwlwifi-5000-1.fw.uu"
Then I changed the file "/usr/src/sys/modules/iwnfw/Makefile" to match 
the new file "iwlwifi-5000-1.fw.uu

After all modules load (driver + firmware), she was recognized as:

iwn0: <Intel(R) PRO/Wireless 5100AGN> mem 0xde000000-0xde001fff irq 16 
at device 0.0 on pci2
iwn0: Reg Domain: , address 00:21:6b:2b:78:04
iwn0: iwn_read_eeprom_ht40: no entry for channel 124
iwn0: iwn_read_eeprom_ht40: no entry for channel 132
iwn0: iwn_read_eeprom_ht40: no entry for channel 149
iwn0: iwn_read_eeprom_ht40: no entry for channel 157
iwn0: [ITHREAD]
iwn0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
iwn0: 11g rates: 1Mbps 2Mbps 5.5Mbps 11Mbps 6Mbps 9Mbps 12Mbps 18Mbps 
24Mbps 36Mbps 48Mbps 54Mbps
iwn0: 11ng MCS: 15Mbps 30Mbps 45Mbps 60Mbps 90Mbps 120Mbps 135Mbps 
150Mbps 30Mbps 60Mbps 90Mbps 120Mbps 180Mbps 240Mbps 270Mbps 300Mbps

But when i try to connect to the web, i have this message:

iwn0: iwn_transfer_firmware: invalid firmware header, main 
[128504,49152], init [118176,49152] boot 0
iwn0: iwn_init_locked: could not load firmware, error 22

Is this a problem of conversion ?
The conversion input command is bad ?

Thanks in advance for your response.
Niko.