Tried updating my sync3 and got an error message

[SaNdMaN]

That won’t work, you didn’t follow the guide:

@SaNdMaN

C) You need to manually create an update USB (as with the ford’s update). Create a folder named SyncMyRide on the root. Place the 2 files from A and B inside that folder, do not extract them, just copy them. To be safe, make sure no other package is inside that folder, so that only these APPS (sync3 versions) packages are located there.

So all the compressed files (GZ ones) must be under that folder, not on the root.
Also, there are 2 issues with the autoinstall.lst file:

1. there’s strange coding at the options statement, maybe due to copying from the webpage. Check the page you downloaded the files from, there’s an option to download the autoinstall.lst file from there directly
2. windows says it’s a text file, so I think that file is named autoinstall.lst.txt in reality. So make Windows display the file extensions to ensure it’s .lst and not .lst.txt