apm 2.5.2 can't recognize one esc.

Hello.

I need advices of yours.

I trying hexa-rotor with apm 2.5.2 and arducopter 3.1.

Problem is,

when I use hexa firmware then only 5 esc running.

When I use quad firmware then only 3 esc running.

I reset the board using terminal mode. but same problem o

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