How to upgrade from Oracle SOA Suite/Business Process Management 12.1.3.x to 12.2.1

(Is strange that here are oracleradio I write in English, but because of the relevance of this post, It thought it would be very useful for any audience and I decided to do it that way. Hope you enjoy it and find it useful).

First of all, this post couldn't had been done without the help of Nayelli Terrazas, Miguel Ramírez and Leonardo González. All of them are part of my team.