You will need a modified BIOS, that has all the whitelists removed.
Get it e.g. here: http://www.usenetddl.com/files.php?q=X6 ... TAV134+zip
Then you can put in any wifi or Sierra or Gobi or whatever card.
i've some new question more:
1)in the link that you wrote me, there are 4 file to download...which one i have to select?
2)i can choose every wifi card even if the seller writes that is not for lenovo/ibm? e.g. this one: http://www.ebay.it/itm/UNLOCKED-Sierra- ... 2488wt_877
3) to use that card i have only to insert in the right slot and that's all? or i have to cover some pin as i red in some other thread?
thankyou so much..i'm not too much skillfull