APM 2.5 slow blinking red LED, no contact with MP. Reprogram 32U2 OK.

I got this second APM from a forum member here in Sweden. He got it DOA.

I bought his NEO-6M and got the bad APM in the deal.

I thought I might give it a go, so he was kind to send it to me when I asked.

When I power up the board, LEDs A,B and C quickly

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