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Creality Ender-4 GPL violation?

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I just got a Creality Ender-4; its ultimately a pretty solid printer- though it does suffer from low production values (my heater cooling fan broke within 14 hours and I had no way to interact with it, so it was just that it died on its own- the board cooling fan squeals like something about to die, etc)

Weirdly my Y axis is reversed.

So I figured 'well this is a standard Marlin firmwear, I'll just hop into the source invert the Y axis and be good to go'.

Then I noticed that no source was included, just 4 hex files.

I contacted the company and they are claiming that it is not open source.

I purchased through ali-express which I at least have found to be very good about applying reasonable penalties to companies for misdeeds.

Can anyone confirm that this is a marlin derivative, is there anything myself or the community can do beyond my either demanding they release the source to me?

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