My recently deceased brother had a significant amo

My recently deceased brother had a significant amount of shares of QTMM stock. At this point I am pretty much resigned to the fact that his investment is now essentially worthless. I've reached out repeatedly to Steve Squires but have never received a response. Perhaps the worst indication is that the company has shut down all of their social media. Other than pie-in-the-sky wishful thinking, does anybody have any confidence that this stock may trade again? Thanks for any input.