Mystrix User Manual is now available to download at https://github.com/203Electronics/Matrix-OS-User-Manual/releases/tag/V2.4.1
The user manual will be updated with every OS update on the GitHub repo.
Anti-slip Pad
Also, something to note with Mystrix is that you will have to install the anti-slip pad yourself. The adhesive is already installed onto the device so you can just peel it and put the silicon pad on.
The reason this is done is that I cannot cover legal information on the device out of the box so I cannot preinstall them.