From what I can tell, this uses an Attiny13a.
Would it be possible on this buck driver to swap in a 25 to fit different firmware ?
I have found where its been done on other drivers, but bucks seem to have a whole other set of considerations.
I have been a fan of guppydrv for a long time, but recently started playing with others like Bistro and Lucidrv2. 
Needless to say, there is some flashing in my future. ( No………not that kind! Sheeeezzz.)
Thanks,
Jim