Ok, I took the plunge and bought a H6400 (finally)
So far it's not connected to the internet, and it's running T-MST14DEUC-2602.2. As far as I know, the current rooting method doesn't work on such a new firmware - but I hope I will be able to root it in the future.
There's no OTA/OTN option to disable in the service menu and I will try to disable it from the extended service menu soon.
Additionaly I redirected the above domains to 127.0.0.1 in my router.
Do I need to do any additional steps to ensure it will never update on its own? I'm new here and maybe I missed something...
Offtopic - @sectroyer: Can I help you with searching a way to root newer firmwares? I have 15 years linux experience and about 5 years in embedded systems (WDTV media player). What I don't have a lot of is time and specialized hardware access (decapping nand chips)
. Would it help if I performed a network scan (like Nessus?). If it's not a secret (something that might help Samsung plug their holes), can you share your ideas for future vectors of attack?
Thanks for your work and keeping the community together