My mistake then, just saw some references about access to source code in WinFlasher folder license files.

Got a couple of smaller issues now after re-flashing. I only replaced the OS and all my data like docs, contacts, messages and photos remained untouched but my calendar data seem to have gone. I thought it was no problem because I had a full local Nokia Suite backup from a week ago but it doesn't seem to contain calendar entries. Is it gone forever or are there local files somewhere (since flashing shouldn't affet user data)?

And just to confirm, despite saying 'apps and settings' the restore procedure doesn't bring my apps back, does it?