I've read on the web that you can somehow entice the HK51 units in the HK factory to join you against the 50ies but the only option the HK51 manufacturing terminal gives me is "set charges" as it has been locked by HK50. Downloading HK50s personality into HK47 doesn't seem to do squat as far as gaining access to this terminal is concerned, and grabbing the module from the dead HK51 in the adjoining room doesn't help me either.
Can somebody please tell me how to complete this quest in a way other than simply just blowing up both HK 50 and 51 terminals?