Hey guys,
had little trouble applying the update, but it works now.
Here's what I did (DO NOT REPRODUCE):
1.) I started with FW K257_5_D1 and just installed the maps update. Runtime of the update was about 2 h 15 mins. The activation of my old map set (2014?) did not activate the new maps. So I tried activator from link "Download" (the one that is modified by darkdll). I did not work for me but I did not try another one.
2.) I updated the FW K257_5_D1 -> K257_6_D1. It went through in no time. Afterwards I tried the same activator, but no luck.
3.) Desperately tried activators from other map versions (fsc file), but no luck.
4.) Searched through the forum for hints.
NOW THIS MAY BE IMPORTANT TO OTHERS: Found out link "Download 2" in the activator section (page 1 of this thread) did work for me! Press NAV and wait until it say's that it's not activated. Insert SD Card with the activator from link "Download 2". After a couple of seconds a new screen should appear - follow instructions (the screen does no look like the one in the pdf). This worked for me.
So, I did not follow the instructions, I know, my fault, but maybe the instructions pdf is not complete or leads to misunderstanding regarding activation.
Thanks to all suppliers.