those layer heights are intentional. the ender 3 prints best with layer heights in multiples of 0.04(since that's the minimum layer change of the ender 3). CHEP goes over why in this video. https://www.youtube.com/watch?v=WIkT8asT90A
As far as activating profiles, as best I can tell older profiles that don't use the "creawesome mod" that was absorbed into 4.2.1 will not work. You'll have to make new profiles.
Instead of updating, I just installed 4.2.1 separately, so I can still open 3.6.0, 4.0, or 4.2.1 and use those older versions and profiles as I update and customize 4.2.1 to my liking.
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mimide 0
It shows a hint that other profiles are not activated and while I was able to clone profiles in the settings menu that you access through the "manage materials" option. I was not able to change any values within those changed profiles other than the names of the profile so I am not sure if I am doing this right or if it was meant this way at all. Any help with reactivating the 0.4 layer hight profile is greatly appreciated.
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