The so-called support page appears to be (mostly) spam.  The link entitled "GRIDSEED MINI SET UP GUIDE" leads to
https://mega.co.nz/#!K1AiQD7Y!xwo3kuWmmYMRrxkZQ4Oryv0fVKZRLXex33ImM_JGWjk
which offers an app to access the file (trojan? don't know, didn't go there)

In my search so far, I noticed some applicable posts elsewhere in the blog D4rkAng3l referenced:
http://cryptomining-blog.com/tag/raspberry-pi-gridseed/
I'm still looking for more info about the gridseeds, but I'll give those images a try.