I uploaded firmware of APM 2.5 by Arduino IDE.Then,I used mission planner to connect APM2.5,but the program didn't response.I think maybe the APM2.5's firmware was broken,so I used mission planner to upload the firmware. But the misson planner upload fail,and print error messege"unable to gain access to bootloader".
I want to know ?How to solve the problem?
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Please help us out, I am getting the same message, on mac and windows.