I'm not sure if its in this thread, but I've read somewhere even though you can remove the demo software, the phones are neutered so they can't make calls.
You can still flash.
~~Call on Heimdall, and tell him to activate the bridge.~~
Use Heimdall instead of Odin.
Here is a tutorial.
https://forum.xda-developers.com/showthread.php?t=2118100