guess I'll answer part of my own question. Just read another thread in the forum. Turns out that the Flash ver7 I downloaded is compiled for x86 (Intel/AMD) CPUs. The 770 has a TI chip based on an ARM9 core. It's a good thing that my install was not successful

But... this still doesn't explain why I can't even run the shell script. Still hope someone could help me out with that part of the puzzle.