@ blinker ………… I am just gonna keep updating this post every time I find something on Narsil that might be useful to you rather than start a new post each time. Hope it helps you………. 
Video by Tom E / BLF Q8 Narsil V2 / Published on Jun 5, 2016
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Disclaimer: I have no idea if what is listed below will be the exact version of Narsil used in the Q8.
But it should give you a bit more info about Narsil hopefully.
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Narsil Triple Flashlight Operation (side electronic switch) // 2017-02-04 T.E. – for NarsilTriple v1.3
http://www.metronixlaser.de/bilder/flashlight/Narsil_Triple_Manual_v1-3.pdf
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NarsilM - configurable e-switch firmware for Multi channels
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My work is done…… thank goodness JasonWW stepped in with some Great Narsil Info