There are 3 variants for each 2017 Impreza model. Got it done this morning
first thing. It appears to fix everything we've seen here!
Just got back from the dealership after 1 hour to get the Infotainment updated.
All done and they did not believe me at first that there was an update as it was
news to them. But they found it and it updated OK and seems better. I was the first
to get it done there. They were curious how I knew about STIS!
"How do you know there is an update????" But there were all cool about it.
I did notice right away that when I went to the volume settings after starting my
fixed car, the Phone volume - which had been going back to 20 every time -
was at 30 where I had set before it kept resetting! So it was there all along.
I'm optimistic. Station presets will need to be redone, but will hopefully stay
this time. But nav and may other settings appeared to stay put.
Here is the PDF for TSB 15-211-17 - sorry I had to scan from what the dealer printed.
The new version image is rotated. But you can see the updated version number.
If you feel brave, you can pay for the update and download from STIS and do it yourself.
It won't come over Wifi - as I had said - it's too complex to do that way.