What is the latest version of Copter than can be loaded on APM 2.6 hardware?

ArduCopter Copter 3.3
1

I’ve tried loading V3.3.3 a few times, but it stays at V3.2.1 - I’m not sure if the flash failed or if V3.3.3 is simply not supported. Thanks.

2

apm latest firmware is v3.2.1
is no longer supported

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3

3.2.1 is the last version you can load on APM. It just doesn’t have the memory capacity or processing power for any newer versions.

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