I'm sure it does work, but you're missing the point.I totally agree with you. In my Q5 I have to proceed as follows (I delete nav partition and database 1st)
User defined mode (green menu)
Engineering menu - update - select ?
90 min - cancel doc
once finished green menu again, user defined mode and install gemmy from K900 firmware (and those that appear with Y by default in such firmware after map update) always cancel doc. If you dont do so, Google earth map appearance cant be selected (refer to post 1 in this thread)
Once restarted (optional, just to get shown in MMI I have latest firmware, 942_3, instead of K900) I repeat last procedure with firmware 942_3 but selecting 2 or 3 another elementes (reflash same version, no worries) selecting from those with N (that's because current version is the same)
After finish this, last map is on the system and last firmware. No need to activate, neither after map upgrade nor after those partial firmware flash.
If you didn't delete the map partition, you wouldn't need to reinstall GEMMI from the MMI SD ...