Sync 3 stuck at "Updating system software"

[F150Chief]

Install it manually. You have plenty of storage. Follow the instructions:

Tutorial: No Gracenotes After Sync 3.4 Installation. Manual Installation Instructions

After installing Sync 3.4 thru the Syn3 Updater, depending on the region you may not see Gracenotes installed on the vehicle. This is due to Sync hardware storage limitations for current or future installations and the deletion of Gracenotes was necessary to upgrade to Sync 3.4 because of the increased file size of the newer app. (Sync 3.4 is nearly twice the size as Sync 3.2/3.3) However, depending on the storage available after the upgrade, it is sometimes possible to re-install Gracenotes man…