@MarMed@dc42 says that it was accidentally disabled in RRF 3.4.4 (possibly earlier versions too, I don’t know) for Duet 2 on SBC. It will be re-enabled on 3.5 and presumably any further 3.4.x releases.
I have taken a look. It appears to have got stuck in the SD card driver because a command failed to complete. I have seen at least one other occurrence of this.
I have it in mind to add a timeout to that function to avoid the reset happening.
Thank you for taking the time to look into it, I forgot to include that I had tried to load the duet web control page to check on the printer's progress when the reset happened.
