I’m having this same problem on windows - UPDATE FAILED when I try to load maslow index.html.gz (have tried multiple versions of the file). Works fine if I use the stock ESP3D index.html.gz file. I did erase_flash using ESPTOOL, re-flashed using platformio, re flashed firmware .82. Have Config and maslow.yaml uploaded fine… I don’t think it’s a file extension issue as ESP3D file is working. Plz help thanks!
(Did have machine running on .81 and everything was nominal… Wish I hadn’t done a full wipe!)