Fiori ERP X2 & EHP8 Upgrade

Hi

i'm during an EhP8 upgrade based on EHP6 ERP with installed FIORI ERP APPLICATIONS X2 1.0 (Central App INT ERP 6.00) SP 06.

During a planned upgrade to EhP7 the Fiori-App was "retrofitted" in existing EHP7/NW74-functionality.

During the upgrade to EhP8/NW75 it's not retrofitted, but I need a "SAINT Upgrade package" etc.

Can anybody tell we what has to be done to successfully upgrade EhP6 to EhP8? What happens with Fiori in NW75/EHP8? Is there a successor version for EhP8 which I missed to select in the MP transaction?

Where can I find the required information (SAP Note?)?

Regards

Michael