well generally the dmu file writes the usually encrypted values to those fields, it is also generally an algorithm of the meid/esn and akey.
that is why you would need to pull those values from the ebay phone and then write that phones meid/esn to your phone so it all will be the same,your phone may or may not have a dmu file, if it does its not going to generate the correct algorithm for boost,hence the need to bypass it and write those values your self.

this subject is not really allowed to be discussed here,only in the premium section,and i am probly outta line answering this so i wont go any further into detail,i only answered you for educational reasons,but lets leave it at that.