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Help HTC desire hd not tethering

I have the htc desire hd which used to be with AT&T in the US. I now use the phone
in Canada with the Bell network, when AT&T flashed the new software (android 2.3.3) over the air my phone was upgraded and since then I cannot tether. When I try to tether to my tablet I get a message contact AT&T to tether this device. I used to be able to tether my phone to my xoom before the upgrade but nothing i do lately works. I have downloaded such apps as "auto tether" but run into the same problem cannot tether the phone to the tablet. Can anyone help me?
 
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