@brady-aiello For the old expansion board you do not need the DFU drivers, as it uses an FTDI or similar USB/Serial bridge. it should work out-of-the-box. If you installed drivers according to the instructions you cited, remove them. See also the instructions here https://docs.pycom.io/chapter/gettingstarted/installation/firmwaretool.html#first in the expansion board 2 tab. Some people had trouble with Windows and the V2.x expansion board, and there is a lot of discussion around it in the board, which sometimes is more confusing than helpful. As result of that, the instructions in the manual were updated. b.t.w.: I prefer the V2 expansion board. Updating with the expansion board V3 or the pyxxxx board seems inconvenient, as it requires unplugging and replugging the board with a tight timing and reconfiguration of each OS.

@paulm Ignore recent post; I fixed this myself: https://forum.pycom.io/topic/4000/fixed-broken-sdcard-py-library-previously-impossible-to-have-external-spi-usd-card-with-pycom-boards

@leo_sol It depend on environment. For me it is quite precise. But as @roadfox say and i in first post introduction about optimized library that library is without calibration part and good as first steep. It is optimized for memory allocation but do not support full sensor features yet