I have a Mach Speed Trio Stealth Pro 9.7 that was essentially bricked when it was given to me, and did a bunch of research, including disassembly, I found some info printed on the mainboard and was able to determine the Chinese manufacturer.
As it turns out Mach Speed is merely an importer. This Tablet was actually manufactured by Wintouch in China.
What is even more interesting is that instead of it having 8gb of internal memory, it actually has 16gb.
I was able to obtain the stock firmware img from Wintouch and loaded it to a microSD card using PhoenixCard 3.09.
Once I slapped it in the tablet, it ticked it's happy way into a new image. Another interesting point is that the tablet language default was Arabic, and I had to actually reset it with adb shell.
setprop persist.sys.language en; setprop persist.sys.country us
The proper firmware image is Q91A30321.img. WIFI/Bluetooth, audio, everything works! There is a later firmware Q91J30412.img but I think this is for the Stealth Pro 9.7c tablet, do not grab this one as the orientation no longer works. Another thing is that the image from Wintouch seems to be a heck of a lot better performance wise. You can get the firmware from the manufacturers site, if you cant read Chinese just open the URL in chrome and go to the download page & translate it.
I figured I'd put this up here for posterity, incase anyone else had this annoying thing.
If you have any questions, let me know!