Problem in changing PDR

[nondito]

I am trying to change the value of PDR 0x0104 from "ff
1f" to "ff 3f"

the following two attempts have the following results
with no visible success.

With iwpriv:
------------
[root<>mars hostap-utils-0.1.3]# iwpriv wlan0
set_rid_word fd10 ff 3f
Interface doesn't accept private ioctl...
set_rid_word (8BEE): Invalid argument

With hostap_rid:
----------------
[root<>mars hostap-utils-0.1.3]# ./hostap_rid wlan0
get fd10
ff 1f
[root<>mars hostap-utils-0.1.3]# ./hostap_rid wlan0
set fd10 ff 3f
[root<>mars hostap-utils-0.1.3]# ./hostap_rid wlan0
get fd10
ff 1f

-----------
hostap-driver-0.1.3
NICID: id=0x8013 v1.0.0 (PRISM II (2.5) Mini-PCI (SST
parallel flash))
PRIID: id=0x0015 v1.1.1
STAID: id=0x001f v1.7.4 (station firmware)
------------

Can anyone suggest me why I can't change the value of
the above PDR using the above tools. What I am
missing, may be anything in the source (macro) needs
to be enabled, or the firmware needs to be flashed
after the PDR rewriting for it to show up .... 

Is there any other ways to change the PDR 0x0104 and
0x0103 ?

Thanks in advance.

Nondito.


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