What exacly happens if I just install official/newer version? Are all modifications reverted then? Or is just upgrading firmware not enough?
If you just want a clean new installation of samygo uninstall the widget in the smarthub and reinstall it again. All script will be set to "delivery condition" cause all is new installed.
If you need some backup of your files copy via ftp and load em up after reinstallation.
For upgrade I can't tell you what will happen or if samygo even will be able to install again because of samsung is closing the backdoors in their upgrades. So if you want to use samygo don't upgrade to latest firm.
Samsung UE46ES6710 ( T-MST10PDEUC-2004) with SamyGo running
I know there is still no upgrade for UEXXD7090 since a long time ago. I upgraded with firmware which was installed before I installed SamyGo so its fine about downgrade. But still thank you pointing that out.