Emergency Download Mode provided by the qualcom chipset. Basically used by oems to initial load phones and also used by forensic labs to extract filesystem images.
Some phones have a way to reboot into this mode and then, with a software loader for that particular phone supplied by the manufacturer, one can write, format, and manipulate partitions I believe. I've heard of folks using it to restore a bricked phone, for instance.
I'll have more of a dig around for the asus firehose loader (I think that is what it is called). And I haven't worked out how to get the rog 3 into this mode yet. I was hoping someone had already travelled that road and could give me some pointers.
