For NA N (North America ONLY or cars with NA N Regions and in Screen Settings) there is a NEW Firmware Update... 70.00.352B_update.up See my signature Below, PDF Install Instructions and Links are in LIME Green inside PDF. They are the same Install Procedure as 335C NO there is Zero Changelog...
In the link where the file is hosted, you’ll find a zip file. In that zip file is a PDF with step by step instructions.
I had mine updated by the dealer recently. I didn't have the confidence to do it myself.
In order for them to do it, they need an "excuse" from you before they do it (for free).
I told a little white lie and told them it was slow to boot up, and that once in a while the rear camera wouldn't kick in (actually happened once two years ago. Good enough for me).
Anyway, the service advisor knew what I was up to, and played along with me.
He just needed something to write on the work order before he could authorize it. It's a game.
Upgrade was done smoothly and easily by an experienced tech.
I subsequently did the nav map update myself. Piece of cake.
I'll do updates again before my three years are up.