APM 2.8 Firmware load issue "Unable to gain access to bootloader"

I got: https://www.unmannedtechshop.co.uk/apm-2-8-flight-controller-board/

I’m trying to load a new firmware onto it using APM planner (Initial Setup) but I get:
“Unable to gain access to bootloader”

I have tried: Windows 8, OSX, APM planner 1 and 2.0.20
Different USB cables
Different firmwares
Reset button

Is there something wrong with this device?


Replying to my own post:
The factory installed bootloader was corrupt. The solution was to install a new one with a SPI programmer. To achieve this I followed these instructions:

All fixed.

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