Hi - I'm having the 'greyed out' firmware input problem. Have tried both a USB 2.0 stick and SD card.
Current Firmware Train: MST2_US_VW_P0631D
Installed software MU verion: 0753
Part Number: 3Q0035876A
Software version: H28.28.185_STD2Nav_NAR
Attempting to update version below sourced from mibsolutions.one
MST2_US_WV_P035DMU0757
SD Card Prep
Format new 32GB SD card, set block size to 4k
Extract zip file to SD card. Root directory structure = \mst2_US_VW_P0635D_MU0757. Below that are two pkgs - STD2plus_nar_VW and STD2nav_NAR-VW
Upgrade
Insert card into SD slot 1. Card is recognized by the 'media' function. Can browse card and see files.
Go to Software update menu, select update
All options for media (CD, SD, USB) are greyed out, unable to select media.
I also tried using a 4GB USB stick and get the exact same behavior. Any idea of what's going wrong? I have a suspicion that somehow my unzip or file structure is wrong and the software update routine is not recognizing the media as a firmware upgrade. Or maybe the software update function is super particular to GB partition size...but I would have thought my 4 GB USB stick would have resolved. Appreciate any suggestions.
Reason for update: Car is new to me (a few weeks old) and radio has started to reboot randomly after seemingly be stable when purchased. However, it's possible it's been a day one problem and I just didn't recognize it. Also, the nav system is stuck on 'starting navigation'. This is a new problem as the nav worked fine until a few days ago. Even when you wait like 30 minutes, the system does not get past this screen.
@mr-fix - really appreciate your vids; they are great!