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ltux Qualcomm, who was believed to be the creator of the EngineerMode APK, also responded to allegations, saying that there are traces of source code from their original app, but the current APK found on devices from various manufacturers has been modified by someone else.
"After an in-depth investigation, we have determined that the EngineerMode app in question was not authored by Qualcomm," Qualcomm claims.
"Although remnants of some Qualcomm source code is evident, we believe that others built upon a past, similarly named Qualcomm testing app that was limited to displaying device information. EngineerMode no longer resembles the original code we provided."