I have the equipment, but only half the clue... It's been a while since I went through my first Z9mini, but I vaguely remember some options around voltage (in the API, perhaps?). However, I'm not sure if it is implemented.

If I had a spare control board (I wonder if they are universal enough I could borrow from an S9 I have that is idle, flash with the Z9 rom, and use it...), I'd yank one of my hash boards out and do a little investigating around the serial buss exposed on the hash board.

I don't have a batch2 device, but I'm wondering if there was a hardware change, or a programming change during initialization that could be influenced via I2C/SPI/etc. with a buspirate or the like.

-j