How do I change/reset volume via firmware?
 

The up volume change button broke. I planned to fix it, but I misplaced the tiny button I wanted to glue/solder back on.

This wasn't a problem for a while because the default volume was at 14 and I could use my headset volume to bring it down, but now somehow it went down to 7, and removing the batteries won't change the default!

How would I go about resetting volume to default so I can procrastinate fixing this thing? :)

The thing that came with it said Wilson Co. version 3.5.31. It's a 1GB.