It seems strange that Marlin is GPL licence and opensource, and yet anycubic act dumb when you ask for their firmware.
Surely the only thing they have modified is some configuration files and added some menu images. Why should they be so secretive?
When Jolly was responding to my emails on another topic I asked him for the firmware source... and he completely ignored the question.
Maybe the chinese reflex to "close" opensource software, and then pretend they comply with the license, when clearly they do not, is so automatic that they do it even when they do not need to :)
Not being able to easily alter my firmware while using the authentic anycubic variant as the base is frustrating. I would definitely consider mentioning this as a negative if people asked me for my opinion on buying from this company, despite the fact that the machines otherwise seem very good.