@phaedrux said in Duet3 6HC does not restart after M999: M999 just resets the board. If the board relies on M80 in config.g to keep the 5V supply on, then of course it will power off. I perfectly understand and agree on this fact. But the behaviour of M999 on firmware 3.2.2 is...
Duet 3 Mainboard 6HC Duet 3 Mainboard 6XD Duet 3 Mini 5+ Put the SD card in the SBC. Connect the ribbon cable to the Duet 3 and SBC. Note the orientation of the red stripe on the ribbon cable indicating pin 1. It is acceptable, especially with longer ribbon cables than shown here...