These instructions were great! After a power fail, my Iotawatt didn’t come back up. Tried cycling power a copule times but it mostly blinked Red-Green-Green-Red.
Took an old 32GB SD card, formatted it, dropped in the files you mentioned from Github, copied over my config.txt and /iotawatt directory, and I’m back in business. No lost data (other than the samples missed while it was offline).
The cranky SD card is a blue 8GB Stromboli, FWIW.