Quick note about filenames and update utilities.
The app does not care about filename, because you have to select it, so that's the file it pushes in.
dfu util however uses filename as arg, so it needs to match the actual filename you wish to push (dfu util has to "find" the file, etc). In the dfu bat file it uses default name of "tinySA.bin"
I have several tiny devices, and the app didn't work on all of them, but dfu util does, so I stick with dfu util.
