" ,,,,As far as have seen by now, you always need the typical brand software to load your relay parameters (also for the initial IP address you need to connect localy valid for Siprotec and others)...."
This is part of the standard. Dialogue with the device (download/upload settings, parameters etc..) should be done by using the vendor's tool.
At least I remember I saw this in the spec. and do not find it strange. We are talking about interoperability and not interchangeability..