I havent fully figured out just WHY we even need to change the MAC adress. But, I did discover that this is needed in order to even get the injection working att all. I suppose it is Nokia implemenmtation of MAC80211 and wl12xx drivers, which makes it fail with a MAC adress of 00:00:00:00:00 - this is usually not an issue, but digging around, made me try to test changing the MAC. And, yes, best success seems to be obtained if the MAC is changed to one beloning to Nokia (eg. change the last digit of the MAC fx. 7E -> 7D).