Read users Setool.
please do not attempt to unlock lg gt400 phone by selected lg db3200-based model - it will kill your phone.
please wait until setool2 will officially support lg gt400 unlock.
flashing should be safe, though (by selecting any lg db3200-based model)

beside that, if anyone willing to send me working locked gt400, please contact with unlocker.
of course, not for free, but not for 1000 eur,please.