alt Hacker Newsyeah EDL loaders for a bunch of production devices exist here [0] also more on various XDA Forum posts for stuff like unbricking guides. It is worth noting for people who don't
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tripdout • yesterday at 9:38 PM
But reading QFUSES specifically requires an EL3 loader "edl qfp qfp.bin -> To dump qfprom fuses (only on EL3 loaders)" and I don't believe most devices programmers (especially as relatively new as the OnePlus 6) run under that privilege level.
A better resource is https://www.temblast.com/ref/loaders.htm