cannot update firmware

what mega ardupilot 1280 could not be used on firmware 2.5.5?
I use mega ardupilot 1280, I wanted to compose the latest frimware version but can not,, what any suggestions for me, besides having to replace ardupilot 1280 to 2560?

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  • 3D Robotics

    The old 1280s (now retired more than a year) are no longer supported in the Mission Planner, but you can load the code via Arduino if you turn off datalogging and the CLI to save memory. 

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