Hello I have some difficult questiones :

What is EMU version in a Firmware?
Which EMU version is the best (for example 2.2.203 or 8.8.8 or 5.8.128)?
What is every number represent for?

What happens to the Firmware Keys when I load a KKE+ key file to receiver?
(I mean Are they overwriten?)

What is OTA Upgrade?
How can I use OTA Ugrade?

How Can I Create a Firmware by myself?

Thanks a lot