What is the upgrade path for embedded/customized jasper report server?

I have a embedded/customized java based application for jasper report server (jasper report server Version-6.0.1).

I want to upgrade it to jasper report server Version-7.1.3

Is there any upgrade path documenation available for upgrder my embedded/custom jasper report server.

Customization Details-

1- Integrated spring secutiy.

2- Integrated WEBSSO.

3- Menu option changes in theam.

4- Some customiztion into theam

5- AES encription

and many more.