4398 installed...
Thought I'd drop a little update in here in case anyone else is giving it a go. Remarkably simple in the end, and without problem.
Car powered-on, but I don't think it needs to be "started"... It's kinda blurry now depending the powertrain. I just got in and hit the power button.
2 finger tap in the top-right of the MMI until it reboots into Engineering mode. I didn't catch the initial menus but it's pretty simple, like "Update".
The below message you'll see each time it reboots, which it does a few times during the process. Leave it be to do it's thing, the screen can also be blank for a couple of minutes as it boots. You do get a message which says "Do not interrupt this process under any circumstances". I did not.
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As it's updating you'll see many progress bars. Just leave it be to do its thing.
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Once it's all done you'll get a summary of what was updated. I've got about 30 minutes between the first photo I took and the last. Add a couple more on at the start and you're looking at 30-40 minutes end-to-end I think.
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Version information
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And the "Home" screen. I feel like this is different, but not a great deal. The MMI will download Web content/Web services a few minutes after being booted-up, then you'll get all the icons back on the Home screen like Weather, News, etc. As far as I can tell everything still works, and I had zero errors along the way.
What still doesn't work for me is the radio info in the Virtual Cockpit display. This stopped working a few weeks back; shows the radio station name and a generic icon... But not the same information as you get if you have it on the MMI e.g. song, artist, album art, etc. Small problemos really
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