its not the same as having a debranded phone ! .
the process of unlocking you mentioned just allows you to use other sim cards on an at&t device . but your device is still an at&t device .
the only true way of unbranding your phone now is to flash an unbranded rom . which i think its still not possible as of now .
Have you tried forcing the update through Zune? Search for an update then see if it finds one, If not search again and you will need to unplug your Modem/Lan cable as it searches again, Its a trial and error thing and getting the timing right is the difficult part, I managed to force the 8107 using this method, There should be some threads lurking around somewhere on XDA, Best of luck.
Also remember it is the network carriers who dish out the updates, Maybe if you put an ATT sim back in it may update easier then you can go back to T-mobile etc.
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