I got a new APM form udrones. However when I connect it to the mission planner to load the firmware, I cannot do so as I get a message window saying, “Failed to read firmware.hex: Index was outside the bound of the array.”
I have another APM before I got this one and it works fine. I was wondering what could be the reason for this. Can this be due to bad hardware? Or there is anyway to fix this?

Thanks