Sync 3 stuck at "Updating system software"

[F150Chief]

Can you post the log.txt file on the USB drive here?

Did you read this tutorial?

Tutorial: Sync 3.4 NON-NAV APIM: Failure to Update to Newer Version Sync 3.4

Tutorial: Sync 3.4 NON-NAV APIM: Failure to Update to Newer Version. Read this document fully before starting any actions. It is your responsibility to follow the instructions as outlined below. (DO NOT USE REFORMAT ON 2020 AND ONWARD VEHICLES) General This tutorial covers the scenario where a NON-NAV APIM with Sync 3.4 installed and will not update to a newer version of Sync 3.4. This is not the same as upgrading from previous versions of Sync (3.0) to Sync 3.4. It is assumed that you have tr…

At this point you are still at 3.4.19274. Run the Tutorial: APIM Interrogator Utility/Create Interrogator Log and attach the xml.