Support Procedure to unlock the T-Mobile ZTE Concord (given a valid unlock code)

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http://androidforums.com – QUESTION: Given a valid 8-digit unlock code, what is the procedure to unlock the T-Mobile pay-as-you-go ZTE Concord cellphone? I've had a pay-as-you-go T-Mobile ZTE Concord, bought at Target, on a T-Mobile contract plan for months. I contacted T-Mobile 3 weeks ago and they finally sent me the 8-digit unlock code. But T-Mobile support had me type 3 different procedures to unlock, all of which failed. Since the phone can be bricked if we do this wrong too many times, I ask here: Q: What is the unlock procedure for the ZTE Concord given I have the IMEI and the 8-digit unlock code, and a 2-yea (General)