802.11b client cannot connect to RB1011UiAS

Hi everyone.
My router is RB1011UiAS-2HnD-IN, but I found I have problems connect to the wireless with 11b devices, my HTC XV6700 can see the AP but cannot connect anyway, even if I allow the TKIP as someone said in another forum; my Palm TX cannot even see my hot spot… How can I solve this problem?
Thank you.