pkg_add /cdrom/... ; can`t find /cdrom/iwi-firmware-2.3.gz : fatal error

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Hi.
My question it`s a simple problem:

# mount_cd9660 /dev/cd0a /cdrom
 # ls -a /cdrom
lists
iwi-firmware-2.3.gz

I mounted the cd-rom. In the cd-rom there is firmware which probably would
solve another problem (wireless internet connection with INTEL PRO/wireless
2200GB).
I am getting an error message when I try to install the firmware contained
in the cd-rom.

pkg_add /cdrom/iwi-firmware-2.3.gz

error message:
can`t find /cdrom/iwi-firmware-2.3.gz
/usr/sbin/pkg_add : /cdrom/iwi-firmware-2.3.gz : fatal error

What should I do to install this file from cd-rom?

Thanks In Advance.
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