First, read this to become familiar with the terminology…
The Different Install Modes - Syn3 Updater - Docs - CyanLabs Official Community
Explanation of each Syn3 Updater tab - Syn3 Updater - Docs - CyanLabs Official Community
To set up the Updater for your vehicle, open the app and follow this:
- Set your Sync info to the current version (3.4.21265), NA, with NAV. Save those settings.
- Go to the Home tab, select a USB drive.
- Select the new options: (3.4.21265), NA, with NA 2.20 maps. The Updater should populate the Select Packages box with the files to be used. Just leave it all selected. Notice that at the bottom left of the app it should say the Install Mode is “Downgrade”.
- Select Start. The Updater will download all the files and transfer them to the USB automatically. Do NOT interrupt this process or you start over. If you already have the files in the Syn3Updater directory under /Downloads, the Updater will skip the download but still check the file for integrity.
- Once this is done, take the USB to the vehicle and plug it in. Make sure there are no other USB devices plugged into the vehicle. This process will reboot twice. DO NOT remove the USB device until the reformat process is finished and you get the message to do so. See the tutorial below.
For reference, see this tutorial for the installation process. The tutorial is for installation of maps for ROW countries, but the process is basically the same. This is for reference only.