I would recommend changing the product code instead of flashing.
Flashing yourself needs to be done with each release, while changing the product code needs to be done once and then if you pick a code with a firmware released early you'll always have it.

I had one of those Swiss codes that don't have the update yet, and replaced it with the code you can find in Navifirm. Right after changing it I found the update on NSU.

Just my 0.02€