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[Lomagno]

check PCB point, 5v and 3.3v point, whether well.

Thank you for your fast response!

PCB check point 5 V running steadily at 5.02 V
PCB check point 3.3 V running at ~3.12 V peaking to 3.20 V every 5 seconds, when the PCB´s power LED slightly dims

PCB malfunction? Incorrect firmware?

PS: I also have a KC868-A4 rev 1.2.5, which does not have any setup problems with its corresponding firmware. So I believe I am following the correct procedures

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check PCB point, 5v and 3.3v point, whether well.

Additionally, the PCB 12 V check point is running steadily at 11.81 V.
Source voltage 12.13 V