ionic splash screen icons generation in ionic3 and 4, 5

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I use ionic 3 and I think ionic 4 its the same , in your project folder , you have a resources directory, go in.
To change the default icon , just change the icon.png by your image, if I remember you need to resize your image (1024*1024).
To change the default splashscreen, its the same (2732*2732).
Don't forget to rename your image (icon.png and splash.png)

And after change, just update your project :

ionic cordova resources

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