Always go with the ones that already got it. ATO is Austrian, BTU is UK (I think), DBT is German, So first try with just changing CSC's, it might pick up the update right away, but it might take it an hour or so before pick it up. If that doesn't work. Try with changing regions. For example: If you choose ATO, change the region to Austria, then try with BTU (region changed to United Kingdom) or DBT (region change it to Germany. I am not promising this will help, but these are combinations that you can do.
Well, I guess you have around 6 hard resets to do, LOL. (Changing CSC causes hard reset, that's normal)
Report back what did you do and if you succeeded