Both the system on(systemon) and system off(systemoff) Blue LED state can be configured in KBI. Some KBI functions can be configured when running Krescue from SD card. Unfortunately, I did not see LED config options running KBI in Krescue.
There is a function in KBI running from Krescue to reset the MCU to factory mode. I ran the reset function, now the blue LED is on when the VIM 3 is power connected but off.
By the way, I assume KBI functions could be accessed running the shell from Krescue, but I don’t know the way.
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