ADF Upgrade from 3.8.0 to 4.2 version

[jigir_shah]

Hello Everyone,

I have my App running on ADF 3.8.0 version. I have few custom components and services. 

I would like to upgrade my app to ADF 4.2.0 version. Can anyone please help to provide brief steps on upgrade? Should I clone 4.2.0 version directly and put my customization one by one?

Any steps/guidance would be appreciated.

[sp2]

Here is upgrade steps displayed for different version.

https://www.alfresco.com/abn/adf/docs/upgrade-guide/